Primary 5 Decimals
Keywords
- Decimal point
- The mark between whole-number and fractional places.
- Tenths
- The first place to the right of the decimal point.
- Hundredths
- The second place to the right of the decimal point.
- Thousandths
- The third place to the right of the decimal point.
- Multiple
- A number made by multiplying another number by a whole number, such as 300 = 3 × 100.
Multiply decimals by 10, 100, 1000 and their multiples
For ×10, ×100 and ×1000, move the decimal point one, two or three places to the right. For example, to multiply by 300, multiply by 3, then by 100.
Choose a multiplier
0.347 × 10 = ?
Follow the curved arrows for each decimal-point move.
Step 0 of 1
Answer:
See worked example
Work out 0.047 × 300.
- Split 300 into 3 × 100.
- 0.047 × 3 = 0.141.
- Multiply by 100: move the decimal point two places right, so 0.141 × 100 = 14.1.
Answer: 14.1.
Try together
Work out 0.235 × 20.
Reveal the answer
20 = 2 × 10. First 0.235 × 2 = 0.47, then 0.47 × 10 = 4.7.
Divide decimals by 10, 100, 1000 and their multiples
For ÷10, ÷100 and ÷1000, move the decimal point one, two or three places to the left. For example, to divide by 300, divide by 3, then by 100.
Choose a divisor
3.75 ÷ 10 = ?
Follow the curved arrows for each decimal-point move.
Step 0 of 1
Answer:
See worked example
Work out 18.9 ÷ 300.
- Split 300 into 3 × 100.
- 18.9 ÷ 3 = 6.3.
- Divide by 100: move the decimal point two places left, so 6.3 ÷ 100 = 0.063.
Answer: 0.063.
Try together
Work out 36 ÷ 300.
Reveal the answer
300 = 3 × 100. First 36 ÷ 3 = 12, then 12 ÷ 100 = 0.12.