# Divide decimal fractions by 1-digit numbers

I can use multiplying by 10 or 100 to divide decimal fractions by 1-digit numbers mentally.

# Divide decimal fractions by 1-digit numbers

I can use multiplying by 10 or 100 to divide decimal fractions by 1-digit numbers mentally.

## Lesson details

### Key learning points

- When we divide decimal fractions by 1-digit numbers, make the decimal into a whole number by multiplying by 10 or 100
- Then use unitising and known facts to divide.
- The answer can then be adjusted by division.

### Common misconception

Children may scale the decimal fraction inaccurately or may forget to scale the answer accordingly to solve the original equation.

If a decimal fraction has only tenths, we multiply by 10 to form a whole number. If the decimal fraction has hundredths, we multiply by 100 to form a whole number. Remember to adjust the answer to solve the original equation.

### Keywords

Unitising - Treating groups that contain the same number of things as ‘ones’ or ‘units’. It is important particularly in handling money and in understanding place value and supports us to think multiplicatively.

Integer - An integer is a whole number with no fractional part e.g. 0, 1, 14, 103 Decimal numbers such as 3.4 are not integers.

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

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## Starter quiz

### 6 Questions

3

5

1

15

30

50

85 ÷ 10

85 ÷ 100

85 ÷ 1

8.5 ÷ 10

8.5 ÷ 100

0.24

0.49

2

2.8

0.27

## Exit quiz

### 6 Questions

0.5

0.6

0.7

0.3

0.08

0.18

0.07

0.12