ICSE Class 3 Mathematics — Flashcards for Quick Revision

A: The smallest 4-digit number is 1000. Why? Because the largest 3-digit number is 999. When we add 1 to it: 999 + 1 = 1000 So, 1000 is the first number with 4 digits.

A: The greatest 4-digit number is 9999. Why? Because if we add 1 to 9999: 9999 + 1 = 10000 This gives a 5-digit number. So, 9999 is the largest number with only 4 digits.

A: Step 1: Thousands = 3 × 1000 = 3000 Step 2: Hundreds = 6 × 100 = 600 Step 3: Tens = 2 × 10 = 20 Step 4: Ones = 4 × 1 = 4 Now add them: 3000 + 600 + 20 + 4 = 3624 Answer: 3624

A: Step 1: Add ones → 6 + 2 = 8 Step 2: Add tens → 4 + 1 = 5 Step 3: Add hundreds → 2 + 7 = 9 Answer: 958

A: Step 1: Ones → 4 + 8 = 12 → write 2, carry 1 Step 2: Tens → 6 + 5 + 1 = 12 → write 2, carry 1 Step 3: Hundreds → 5 + 2 + 1 = 8 Answer: 822

A: Step 1: Ones → 4 + 8 = 12 → write 2, carry 1 Step 2: Tens → 0 + 2 + 1 = 3 Step 3: Hundreds → 3 + 8 = 11 → write 1, carry 1 Step 4: Thousands → 3 + 1 = 4 Answer: 4132

A: Step 1: Write numbers in columns. ``` H T O 4 2 8 - 2 1 7 ------- ``` Step 2: Subtract ones → 8 – 7 = 1 Step 3: Subtract tens → 2 – 1 = 1 Step 4: Subtract hundreds → 4 – 2 = 2 Answer: 211

A: Step 1: Align numbers by place value. ``` H T O 6 8 1 - 4 7 1 ------- ``` Step 2: Ones → 1 – 1 = 0 Step 3: Tens → 8 – 7 = 1 Step 4: Hundreds → 6 – 4 = 2 Answer: 210

A: Step 1: Ones → 5 < 6, so borrow from tens. 2 tens become 1 ten, 5 ones become 15. 15 – 6 = 9 Step 2: Tens → 1 – 1 = 0 Step 3: Hundreds → 9 – 4 = 5 Answer: 509