💡 Key Idea
Multiplying and dividing by 10, 100, 1000 is simply moving the decimal point! No complex calculations needed — it's the fastest way to work with powers of 10.
✖️ Multiplying by 10, 100, 1000
Rule: Move the decimal point to the RIGHT →
| Multiply by | Zeros | Move Right |
|---|---|---|
| × 10 | 1 zero | 1 place → |
| × 100 | 2 zeros | 2 places →→ |
| × 1000 | 3 zeros | 3 places →→→ |
Add zeros on the right if needed!
➗ Dividing by 10, 100, 1000
Rule: Move the decimal point to the ← LEFT
| Divide by | Zeros | Move Left |
|---|---|---|
| ÷ 10 | 1 zero | ← 1 place |
| ÷ 100 | 2 zeros | ←← 2 places |
| ÷ 1000 | 3 zeros | ←←← 3 places |
Add zeros on the left if needed!
📊 Interactive Visualization: Moving the Decimal Point
Interactive visualization — available in the full lesson