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Updated 6 August 2026

NCERT Solutions

Thousands Around Us

CBSE · Class 4 · Mathematics

NCERT Solutions for Thousands Around Us — CBSE Class 4 Mathematics.

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Donations Table – Writing Numbers

1Write the number for: 4 Ones + 7 TensShow solution

Given: 4 Ones + 7 Tens

Formula: Tens × 10 + Ones × 1

7 \times 10 + 4 \times 1 = 70 + 4 = 74

Answer: 74

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2Write the number for: 100 – 7Show solution

Given: 100 – 7

100 - 7 = 93

Answer: 93

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3Write the number for: TwelveShow solution

Given: Twelve

Twelve in numerals = 12

Answer: 12

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4Write the number for: 10 + 10 + 10 + 10 + 10Show solution

Given: 10 + 10 + 10 + 10 + 10

10 \times 5 = 50

Answer: 50

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5Write the number for: Ten more than three hundred twelveShow solution

Given: Ten more than three hundred twelve

Three hundred twelve = 312

Ten more =

312 + 10 = 322

Answer: 322

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HTO Blocks – People at Community Lunch

1Draw HTO blocks for 52 people, 145 people, 325 people, and 508 people. Also identify the time slot with the most and least number of people.Show solution

52 people:
HTO representation: 0 Hundreds, 5 Tens, 2 Ones
Draw 5 rods (tens) and 2 unit cubes (ones).

145 people:
HTO representation: 1 Hundred, 4 Tens, 5 Ones
Draw 1 flat (hundred), 4 rods (tens), 5 unit cubes (ones).

325 people:
HTO representation: 3 Hundreds, 2 Tens, 5 Ones
Draw 3 flats (hundreds), 2 rods (tens), 5 unit cubes (ones).

508 people:
HTO representation: 5 Hundreds, 0 Tens, 8 Ones
Draw 5 flats (hundreds), 0 rods (tens), 8 unit cubes (ones).

Comparing: 52 < 145 < 325 < 508

The time slot when the most number of people came for lunch: The slot with 508 people.

The time slot when the least number of people came for lunch: The slot with 52 people.

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Let Us Do

1aMake 3-digit numbers using the digits 3 and 7. Write the numbers in the boxes. Circle the smallest and cross out the largest.Show solution

Given digits: 3 and 7 (repetition allowed for 3-digit numbers)

All possible 3-digit numbers using only 3 and 7:

333, 337, 373, 377, 733, 737, 773, 777

One number is already given as 333.

Arranging in order:

333 < 337 < 373 < 377 < 733 < 737 < 773 < 777

Smallest: Circle 333

Largest: Cross out 777

The four boxes can be filled with any four of the remaining numbers, for example: 337, 373, 733, 773 (answers may vary).

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1bMake six 3-digit numbers using the digits 3, 5, 0, 8 such that all numbers are less than 550. You can repeat the digits.Show solution

Given digits: 3, 5, 0, 8 (repetition allowed); condition: number < 550

A 3-digit number less than 550 means it can start with 1–5, but if it starts with 5, the hundreds digit is 5 and tens digit must be less than 5.

Using digits 3, 5, 0, 8:

Six possible numbers less than 550:
1. 300 (3 Hundreds, 0 Tens, 0 Ones)
2. 305 (3 Hundreds, 0 Tens, 5 Ones)
3. 350 (3 Hundreds, 5 Tens, 0 Ones)
4. 383 (3 Hundreds, 8 Tens, 3 Ones)
5. 500 (5 Hundreds, 0 Tens, 0 Ones)
6. 538 (5 Hundreds, 3 Tens, 8 Ones)

*(Answers may vary as long as all six numbers use only digits 3, 5, 0, 8 and are less than 550.)*

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1cMark the numbers you made in 1(b) on the number line.Show solution

Using the six numbers from 1(b): 300, 305, 350, 383, 500, 538

On a number line from 300 to 550:
- Mark 300 at the start.
- Mark 305 just after 300 (5 units ahead).
- Mark 350 at the midpoint between 300 and 400.
- Mark 383 between 350 and 400.
- Mark 500 at the 500 position.
- Mark 538 between 500 and 550.

*(Students should draw a number line from 300 to 550 and place dots/marks at each of the six numbers in the correct relative positions.)*

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Fill in the Blanks – Number Sequences (Question 2)

2Fill in the blanks with appropriate numbers (number sequences shown in images 3–7).Show solution

Since the images cannot be seen, the general method for filling blanks in number sequences is:

Step 1: Identify the pattern (common difference) by looking at the given numbers.

Step 2: Add or subtract the common difference to find the missing numbers.

Example (a): If the sequence is 100, 200, ___, 400, 500 → common difference = 100 → missing number = 300

Example (b): If the sequence is 10, 20, ___, 40 → common difference = 10 → missing number = 30

Example (c): If the sequence is 500, 510, 520, ___ → common difference = 10 → missing number = 530

Example (d): If the sequence is 990, 995, ___, 1005 → common difference = 5 → missing number = 1000

Example (e): If the sequence is 100, 200, 300, ___, 500 → common difference = 100 → missing number = 400

*(Students should apply the same method to the actual sequences shown in their textbook images.)*

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How Many People Came for the Community Lunch

1How many people came for the community lunch? Fill in the blanks with appropriate numbers (based on the Dienes block images).Show solution

Given: The four time slots had 52, 145, 325, and 508 people.

Total number of people:

52 + 145 + 325 + 508

= 197 + 325 + 508

= 522 + 508

= 1030

Total people who came for the community lunch = 1030

Fill in the blanks (place value):
- 1030 = 1 Thousand + 0 Hundreds + 3 Tens + 0 Ones
- Th = 1, H = 0, T = 3, O = 0

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Question 3 – Identify the Range of Numbers

3Identify the range of numbers most suitable for the following situations.Show solution

Left column:
- Number of children in your village → More than 1000
- Number of teachers in your school → 10 to 50
- Number of tables in your classroom → Only 1 (or 2 to 5)
- Number of books in your library → 500 to 1000
- Number of leaves in a plant → 50 to 100
- Number of pages in your math textbook → 100 to 200
- Number of ants in an anthill → More than 1000

Right column:
- Number of books in your classroom → 50 to 100
- Number of fingers in your classroom → 200 to 500
- Number of leaves in a tree → More than 1000
- Number of letters on this page → 200 to 500
- Number of children in your school → 500 to 1000
- Number of girls in your school → 200 to 500
- Number of steps to reach school → 100 to 200 (answers may vary)

Things around us that are more than 1000 in number (examples):
- Grains of rice in a bag
- Stars visible in the night sky
- Leaves on a large tree
- Ants in an anthill
- Pages in a large dictionary

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Let Us Break Up One-Thousand

aWe are at 900. How much more to make 1000? 900 + ___ = 1000Show solution

1000 - 900 = 100

900 + \mathbf{100} = 1000

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bMark 800. How much more to make 1000? 800 + ___ = 1000Show solution

1000 - 800 = 200

800 + \mathbf{200} = 1000

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cMark 850. How much more to 1000? 850 + ___ = 1000Show solution

1000 - 850 = 150

850 + \mathbf{150} = 1000

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dMark 760. How much more to 1000? 760 + ___ = 1000Show solution

1000 - 760 = 240

760 + \mathbf{240} = 1000

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eMark 400. How much less is 400 than 1000? 1000 - ___ = 400Show solution

1000 - 400 = 600

1000 - \mathbf{600} = 400

So 400 is 600 less than 1000.

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fComplete the addition facts leading to 1000.Show solution

Some addition facts that make 1000:

100 + 900 = 1000

200 + 800 = 1000

300 + 700 = 1000

400 + 600 = 1000

500 + 500 = 1000

250 + 750 = 1000

450 + 550 = 1000

*(Students should fill in the specific pairs shown in their textbook image using the same logic: the two numbers must add up to 1000.)*

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Grouping and Regrouping

1Look at the pictures. Circle groups of 10 Ones or 10 Tens. Write the final number. (Third picture — Tens and Ones)Show solution

Given example in book: The third picture shows some tens rods and ones cubes.

Method:
- Count all the tens rods and ones cubes.
- Circle every group of 10 ones to make a new ten.
- Write: ___ Tens + ___ Ones = ___

*(Since the image is not visible, students should count the blocks shown and apply the grouping rule. For example, if there are 4 tens and 7 ones:)*

40 + 7 = 47

4 \text{ Tens} + 7 \text{ Ones} = 47

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2Look at the pictures. Circle groups of 10 Ones, 10 Tens, 10 Hundreds. Write the final number. (Hundreds + Tens + Ones picture)Show solution

Method:
- Count all hundreds flats, tens rods, and ones cubes.
- Circle every 10 ones to make a ten; circle every 10 tens to make a hundred.
- Write: ___ Hundreds + ___ Tens + ___ Ones = ___

*(Since the image is not visible, students should count the blocks shown. For example, if there are 3 hundreds, 2 tens, and 5 ones:)*

300 + 20 + 5 = 325

3 \text{ Hundreds} + 2 \text{ Tens} + 5 \text{ Ones} = 325

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Circle Groups – Grouping and Regrouping Exercises

a14 Ones — Circle groups of 10. Fill in the Tens and Ones table.Show solution

Given: 14 Ones

Circle a group of 10 ones → that makes 1 Ten.
Remaining: 4 Ones.

14 \text{ Ones} = 1 \text{ Ten} + 4 \text{ Ones} = 14

| Tens | Ones |
|------|------|
| 1 | 4 |

Number = 14

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b23 Ones — Circle groups of 10. Fill in the Tens and Ones table.Show solution

Given: 23 Ones

Circle a group of 10 ones → 1 Ten. Remaining: 13 Ones.
Circle another group of 10 ones → 1 Ten. Remaining: 3 Ones.

Total: 2 Tens + 3 Ones

23 \text{ Ones} = 2 \text{ Tens} + 3 \text{ Ones} = 23

| Tens | Ones |
|------|------|
| 2 | 3 |

Number = 23

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c1 Ten and 27 Ones — Circle groups of 10. Fill in the Tens and Ones table.Show solution

Given: 1 Ten and 27 Ones

From 27 Ones: circle 2 groups of 10 → 2 more Tens, with 7 Ones remaining.

Total Tens = 1 + 2 = 3 Tens, 7 Ones

10 + 27 = 37

3 \text{ Tens} + 7 \text{ Ones} = 37

| Tens | Ones |
|------|------|
| 3 | 7 |

Number = 37

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d10 Tens and 6 Ones — Fill in the Hundreds, Tens, Ones table. (Answer given as 106)Show solution

Given: 10 Tens and 6 Ones

10 Tens = 1 Hundred (circle the 10 tens to make 1 hundred)
Remaining: 0 Tens, 6 Ones

100 + 0 + 6 = 106

1 \text{ Hundred} + 0 \text{ Tens} + 6 \text{ Ones} = 106

| Hundreds | Tens | Ones |
|----------|------|------|
| 1 | 0 | 6 |

Number = 106

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e11 Tens and 14 Ones — Circle groups of 10. Fill in the Hundreds, Tens, Ones table.Show solution

Given: 11 Tens and 14 Ones

Step 1: From 14 Ones, circle 1 group of 10 → 1 more Ten, 4 Ones remaining.
Now we have: 11 + 1 = 12 Tens and 4 Ones.

Step 2: From 12 Tens, circle 1 group of 10 Tens → 1 Hundred, 2 Tens remaining.

Total: 1 Hundred + 2 Tens + 4 Ones

110 + 14 = 124

1 \text{ Hundred} + 2 \text{ Tens} + 4 \text{ Ones} = 124

| Hundreds | Tens | Ones |
|----------|------|------|
| 1 | 2 | 4 |

Number = 124

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f1 Hundred, 12 Tens and 14 Ones — Circle groups of 10. Fill in the Hundreds, Tens, Ones table.Show solution

Given: 1 Hundred, 12 Tens, 14 Ones

Step 1: From 14 Ones, circle 1 group of 10 → 1 more Ten, 4 Ones remaining.
Now: 1 Hundred, 12 + 1 = 13 Tens, 4 Ones.

Step 2: From 13 Tens, circle 1 group of 10 Tens → 1 more Hundred, 3 Tens remaining.
Now: 1 + 1 = 2 Hundreds, 3 Tens, 4 Ones.

100 + 120 + 14 = 234

2 \text{ Hundreds} + 3 \text{ Tens} + 4 \text{ Ones} = 234

| Hundreds | Tens | Ones |
|----------|------|------|
| 2 | 3 | 4 |

Number = 234

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Let Us Solve – Grouping

a45 Ones — Identify and write the number.Show solution

Given: 45 Ones

Circle 4 groups of 10 ones → 4 Tens, 5 Ones remaining.

45 \text{ Ones} = 4 \text{ Tens} + 5 \text{ Ones} = \mathbf{45}

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b39 Ones — Identify and write the number.Show solution

Given: 39 Ones

Circle 3 groups of 10 ones → 3 Tens, 9 Ones remaining.

39 \text{ Ones} = 3 \text{ Tens} + 9 \text{ Ones} = \mathbf{39}

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c35 Tens — Identify and write the number.Show solution

Given: 35 Tens

Circle 3 groups of 10 Tens → 3 Hundreds, 5 Tens remaining.

35 \text{ Tens} = 3 \text{ Hundreds} + 5 \text{ Tens} + 0 \text{ Ones} = \mathbf{350}

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d86 Tens — Identify and write the number.Show solution

Given: 86 Tens

Circle 8 groups of 10 Tens → 8 Hundreds, 6 Tens remaining.

86 \text{ Tens} = 8 \text{ Hundreds} + 6 \text{ Tens} + 0 \text{ Ones} = \mathbf{860}

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e10 Tens and 1 One — Identify and write the number.Show solution

Given: 10 Tens and 1 One

10 Tens = 1 Hundred

1 \text{ Hundred} + 0 \text{ Tens} + 1 \text{ One} = \mathbf{101}

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f15 Tens and 23 Ones — Identify and write the number.Show solution

Given: 15 Tens and 23 Ones

Step 1: 23 Ones = 2 Tens + 3 Ones
New total: 15 + 2 = 17 Tens, 3 Ones

Step 2: 17 Tens = 1 Hundred + 7 Tens

1 \text{ Hundred} + 7 \text{ Tens} + 3 \text{ Ones} = \mathbf{173}

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g34 Tens and 12 Ones — Identify and write the number.Show solution

Given: 34 Tens and 12 Ones

Step 1: 12 Ones = 1 Ten + 2 Ones
New total: 34 + 1 = 35 Tens, 2 Ones

Step 2: 35 Tens = 3 Hundreds + 5 Tens

3 \text{ Hundreds} + 5 \text{ Tens} + 2 \text{ Ones} = \mathbf{352}

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h19 Tens and 10 Ones — Identify and write the number.Show solution

Given: 19 Tens and 10 Ones

Step 1: 10 Ones = 1 Ten + 0 Ones
New total: 19 + 1 = 20 Tens, 0 Ones

Step 2: 20 Tens = 2 Hundreds + 0 Tens

2 \text{ Hundreds} + 0 \text{ Tens} + 0 \text{ Ones} = \mathbf{200}

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i2 Hundreds, 13 Tens and 7 Ones — Identify and write the number.Show solution

Given: 2 Hundreds, 13 Tens, 7 Ones

Step 1: 13 Tens = 1 Hundred + 3 Tens
New total: 2 + 1 = 3 Hundreds, 3 Tens, 7 Ones

3 \text{ Hundreds} + 3 \text{ Tens} + 7 \text{ Ones} = \mathbf{337}

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Beyond 1000 – Fill in the Table

1Look at the table and fill in the blanks for numbers 1001 to 1003, 1005, 1100, 1038, and others.Show solution

Row 1: Expanded Form:

1000 + 1

, Number: 1001
- Th = 1, H = 0, T = 0, O = 1
- Number Name: One thousand one

Row 2: Number: 1002
- Expanded Form:

1000 + 2

- Th = 1, H = 0, T = 0, O = 2
- Number Name: One thousand two

Row 3: Number: 1003
- Expanded Form:

1000 + 3

- Th = 1, H = 0, T = 0, O = 3
- Number Name: One thousand three

Row 4: Th = 1, H = 0, T = 0, O = 5
- Expanded Form:

1000 + 5

- Number: 1005
- Number Name: One thousand five

Row 5 (100010): This represents 1 Thousand and 1 Ten:
- Expanded Form:

1000 + 10

- Th = 1, H = 0, T = 1, O = 0
- Number: 1010
- Number Name: One thousand ten

Row 6: Expanded Form:

1000 + 100

, Number: 1100
- Th = 1, H = 1, T = 0, O = 0
- Number Name: One thousand one hundred

Row 7: Number: 1038
- Expanded Form:

1000 + 30 + 8

- Th = 1, H = 0, T = 3, O = 8
- Number Name: One thousand thirty eight

Row 8 (100010010011100): Counting tokens: 1 Thousand + 2 Hundreds + 3 Tens + 4 Ones (example interpretation)
- Expanded Form:

1000 + 200 + 30 + 4

- Number: 1234
- Number Name: One thousand two hundred thirty four

Row 9 (10100100100101000): Counting tokens: 2 Thousands + 1 Hundred + 0 Tens + 0 Ones (example)
- Expanded Form:

2000 + 100

- Number: 2100
- Number Name: Two thousand one hundred

Row 10: Expanded Form:

3000 + 0 + 10 + 9

- Th = 3, H = 0, T = 1, O = 9
- Number: 3019
- Number Name: Three thousand nineteen

*(Note: Rows 8 and 9 depend on the actual token images. Students should count the tokens carefully and apply the same method.)*

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Number Sequences – Forward and Backward (Question 1 under Beyond 1000)

1aWrite the numbers in a sequence — forward as indicated (image 30).Show solution

Since the image is not visible, the general method is:

Step 1: Identify the starting number and the common difference (step size).
Step 2: Add the common difference repeatedly for a forward sequence.

Example: If the sequence starts at 1000 and increases by 1:

1000, 1001, 1002, 1003, 1004, 1005 \ldots

Example: If the sequence starts at 1000 and increases by 10:

1000, 1010, 1020, 1030, 1040, 1050 \ldots

*(Students should apply this method to the actual sequence in their textbook.)*

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1bWrite the numbers in a sequence — backward as indicated (image 31).Show solution

Step 1: Identify the starting number and the common difference.
Step 2: Subtract the common difference repeatedly for a backward sequence.

Example: If the sequence starts at 1050 and decreases by 10:

1050, 1040, 1030, 1020, 1010, 1000 \ldots

*(Students should apply this method to the actual sequence in their textbook.)*

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1cWrite the numbers in a sequence — forward as indicated (image 32).Show solution

Example: If the sequence starts at 2000 and increases by 100:

2000, 2100, 2200, 2300, 2400, 2500 \ldots

*(Students should apply this method to the actual sequence in their textbook.)*

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1dWrite the numbers in a sequence — backward as indicated (image 33).Show solution

Example: If the sequence starts at 5000 and decreases by 100:

5000, 4900, 4800, 4700, 4600, 4500 \ldots

*(Students should apply this method to the actual sequence in their textbook.)*

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Let Us Play – Place Value Slider

a1895 — increase the number by 1Show solution

1895 + 1 = \mathbf{1896}

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b2785 — increase the number by 10Show solution

2785 + 10 = \mathbf{2795}

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c3369 — decrease the number by 2Show solution

3369 - 2 = \mathbf{3367}

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d5648 — decrease the number by 10Show solution

5648 - 10 = \mathbf{5638}

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e6487 — increase the number by 20Show solution

6487 + 20 = \mathbf{6507}

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Let Us Think

1Ram wrote 7 Thousand 0 Hundreds 2 Tens 4 Ones as 724. Is this correct? Write the correct number.

2Richa wrote 5 Thousand 6 Hundreds 0 Tens 3 Ones as 563. Is this correct? Write the correct number.

Number Line – Questions

1Which of these numbers lie between 2226 and 3226? Circle the correct answers: 3316, 3236, 2236, 2216, 3126, 3216

2a1001 and 1038 are marked on the number line. Mark 1043, 1069, and 1084 on the same number line.

2bMark the following numbers on the number line: 2025, 2080, 2175, 2245, 2295, 2310, 2390, 2430, 2460

2cMark the following numbers on the number line: 5512, 5548, 5590, 5636, 5673, 5695

2dMark the following numbers on the number line: 8679, 8990, 8923, 8763

Arrow Cards Activity

1What cards are used to make 4085? Write it in expanded form and in words.

Find Me! – Grid Activity

1Find the number 3782 in the grid.

2Find: Two thousand five hundred and seventy six (2576) in the grid.

3Find: A 4-digit number with all digits the same.

4Find: The smallest 4-digit number in this table.

5Find: The largest 4-digit number in this table.

6Find: A number more than 5000 and less than 5200.

7Find: A number between 5600 and 6300.

8Find: A 4-digit number all of whose digits can be found on a die (1–6).

Let Us Solve – Using Tokens (1s, 10s, 100s, 1000s)

1a6 Tens and 22 Ones — Write in the table.

1b4 Tens and 12 Ones — Write in the table.

1c3 Hundreds, 14 Tens, and 8 Ones — Write in the table.

1d12 Hundreds, 18 Tens, and 2 Ones — Write in the table.

1e1 Thousand, 5 Hundreds, 10 Tens, and 17 Ones — Write in the table.

2ACircle the number that is bigger: (i) 30 or 300, (ii) 6000 or 600, (iii) 6000 or 3000

2BCircle the number that is smaller: (i) 2 Ones or 2 Hundreds, (ii) 5 Tens or 2 Thousands, (iii) 7 Tens or 4 Hundreds

Comparing Numbers – Gurudwara Plates Record

1Compare February (1213) and March (2121) using < and >.

2Why is 3102 bigger than 3012? Which position helped you decide?

Let Us Do – Comparing Numbers

1aCompare: 2190 ☐ 2910

1bCompare: 7087 ☐ 7088

1cCompare: 1009 ☐ 9001

1dCompare: 982 ☐ 1024

2Order the prices from smallest to biggest: ₹1986, ₹1099, ₹1899

3Arrange the runs scored by women cricketers in increasing order: Debbie Hockley 4064, Suzie Bates 5114, Karen Rolton 4814, Mithali Raj 7805, Charlotte 6002

4Arrange the mountain ranges in decreasing order of height: Kangchenjunga 8586, Mullayanagiri 1930, Chaukhamba I 7138, Bailadila Range 1276, Minda Devi 7816, K2 8611, Ralsubai 1646

5aCompare: 2 Tens + 4 Thousands + 3 Hundreds ☐ 2043

5bCompare: 2 Tens + 4 Thousands + 3 Hundreds ☐ 4320

5cCompare: 2 Thousands + 9 Hundreds + 9 Tens + 9 Ones ☐ 3000

5dCompare: 15 Ones + 9 Tens + 3 Hundreds ☐ 1593

5eCompare: 5000 + 30 + 4 ☐ 5034

5fCompare: 5000 + 300 + 4 ☐ 5340

6aFill the blank with digits 0–9: 7__3 < 768_

6bFill the blank with digits 0–9: 853__ < 8__3__

6cFill the blank with digits 0–9: __2__1 < 5__2__

CHALLENGE!

1There are 99 numbers strictly between 700 and 800. How many numbers are there strictly between 7000 and 8000? Circle the correct answer: 900, 999, 1000

Let Us Explore

1Make as many four-digit numbers as possible using the digits 2, 3, 4, 7 without repetition. There are 24 different numbers possible. Arrange them in decreasing order.

2Compare with your friends to find what other numbers they have made. How do you know you have all possible such numbers?

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Frequently Asked Questions

What are the important topics in Thousands Around Us for CBSE Class 4 Mathematics?

Thousands Around Us covers several key topics that are frequently asked in CBSE Class 4 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.

How to score full marks in Thousands Around Us — CBSE Class 4 Mathematics?

Understand the core concepts first, then work through the 40 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Where can I get free NCERT Solutions for Thousands Around Us Class 4 Mathematics?

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Thousands Around Us

Studying Thousands Around Us? Get the full interactive chapter.

Donations Table – Writing Numbers

HTO Blocks – People at Community Lunch

Let Us Do

Fill in the Blanks – Number Sequences (Question 2)

How Many People Came for the Community Lunch

Question 3 – Identify the Range of Numbers

Let Us Break Up One-Thousand

Grouping and Regrouping

Circle Groups – Grouping and Regrouping Exercises

Let Us Solve – Grouping

Beyond 1000 – Fill in the Table

Number Sequences – Forward and Backward (Question 1 under Beyond 1000)

Let Us Play – Place Value Slider

Let Us Think

Number Line – Questions

Arrow Cards Activity

Find Me! – Grid Activity

Let Us Solve – Using Tokens (1s, 10s, 100s, 1000s)

Comparing Numbers – Gurudwara Plates Record

Let Us Do – Comparing Numbers

CHALLENGE!

Let Us Explore

Frequently Asked Questions

Sources & Official References

More resources for Thousands Around Us

Practice Quiz

Important Questions

Revision Notes

Formula Sheet

Chapter Summary

Concept Maps

Study Plan

Flashcards

Syllabus

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