🔢 Maths
Multiplying and Dividing by 10 and 100
Ages 9–11You will learn
Multiply and divide whole numbers by 10 and 100 by moving the digits on a place value chart.
Before you start
Place value with thousands, hundreds, tens and ones.
Quick answer
When you multiply by 10, every digit moves 1 place to the left. When you multiply by 100, every digit moves 2 places to the left. Dividing moves the digits to the right instead. So 34 × 10 = 340 and 340 ÷ 10 = 34.
Let’s learn
Multiplying by 10 makes a number 10 times bigger. Each digit moves 1 place to the left.
| Thousands | Hundreds | Tens | Ones |
|---|---|---|---|
| 3 | 4 | ||
| 3 | 4 | 0 |
34 × 10 = 340. The 0 fills the empty ones place.
Multiplying by 100
Multiplying by 100 moves each digit 2 places to the left.
- 8 × 100 = 800
- 25 × 100 = 2,500
Dividing by 10 and 100
Dividing does the opposite. The digits move to the right.
- 90 ÷ 10 = 9 (1 place right)
- 3,600 ÷ 100 = 36 (2 places right)
Try it
Start with 7. Multiply by 10, then by 10 again. What do you get? Is it the same as 7 × 100?
Check what you know
Choose an answer, then press Check. You can try again if you need to.
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