We the Travellers—II
CBSE · Class 5 · Mathematics
Flashcards for We the Travellers—II — CBSE Class 5 Mathematics. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is the relationship between addition and subtraction? If 46 + 21 = 67, what are the two subtraction facts?
Answer
Addition and subtraction are inverse operations. If 46 + 21 = 67, then: • 67 - 21 = 46 • 67 - 46 = 21 This means we can check addition by subtraction and vice versa.
What are consecutive numbers? Give three examples.
Answer
Consecutive numbers are numbers that follow one another in order without skipping any number. Examples: • 1, 2, 3, 4, 5 • 29, 30, 31, 32 • 2023, 2024, 2025…
A lorry has 28 litres of fuel. An additional 75 litres is filled. What is the total fuel?
Answer
Total fuel = 28 + 75 = 103 litres Step-by-step: 28 + 75 ____ 103 The lorry now has 103 litres of fuel.
Find the sum: 49 + 89
Answer
49 + 89 = 138 Using place value: T O 4 9 + 8 9 ______ 1 3 8 9 + 9 = 18 (write 8, carry 1) 4 + 8 + 1 = 13 (write 3, carry 1) Answer: 138…
A minibus has 18l of fuel left. After refuelling, it shows 65l. How much fuel was added?
Answer
Fuel added = 65 - 18 = 47 litres Step-by-step: 65 - 18 ____ 47 47 litres of fuel was added to the minibus.
What is the pattern in sums of 2 consecutive numbers? Are they even or odd?
Answer
Sums of 2 consecutive numbers are always ODD. Examples: • 1 + 2 = 3 (odd) • 2 + 3 = 5 (odd) • 3 + 4 = 7 (odd) • 4 + 5 = 9 (odd) Pattern: The difference between successive sums is always 2.
What is the pattern in sums of 3 consecutive numbers? Are they even or odd?
Answer
Sums of 3 consecutive numbers follow an EVEN-ODD pattern. Examples: • 1 + 2 + 3 = 6 (even) • 2 + 3 + 4 = 9 (odd) • 3 + 4 + 5 = 12 (even) • 4 + 5 + 6 = 15 (odd) Pattern: The difference between success…
Find 67 + 68 + 69 without adding directly. (Hint: Use the middle number pattern)
Answer
67 + 68 + 69 = 68 × 3 = 204 Pattern: For 3 consecutive numbers, the sum equals the middle number × 3. Check: 67 + 68 + 69 = 204 ✓ This works because the middle number is the average of all three.
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- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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