Decimals × and ÷ 10, 100, 1000
You learn to multiply and divide decimals by 10, 100 and 1000 by moving the decimal point.
How to work it out
- Count the zeros: 10 has 1, 100 has 2, 1000 has 3.
- Move the decimal point that many places: right to multiply, left to divide.
- Fill any empty places with a 0.
13.4 × 10 = 34234 × 10 = 340
3.4 × 100
- 100 has 2 zeros.
- Move the decimal point 2 places to the right.
- There is only one digit after the decimal point, so fill the gap with a 0.
- So 3.4 × 100 = 340.
134 × 10 = 3402340 × 10 = 3.400
More examples
45 ÷ 100
- 100 has 2 zeros: move the decimal point 2 places to the left.
- Put a 0 in front of the decimal point: 45 ÷ 100 = 0.45.
0.25 × 10
- 10 has one 0: move the decimal point 1 place to the right.
- So 0.25 × 10 = 2.5.
125 × 10 = 2502de komma schuift één plaats naar rechts