New
New
Year 5

# Multiply tenths with whole numbers

I can use known multiplication facts and unitising to multiply tenths with whole numbers.

New
New
Year 5

# Multiply tenths with whole numbers

I can use known multiplication facts and unitising to multiply tenths with whole numbers.

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## Lesson details

### Key learning points

1. There are 10 tenths in one whole.
2. Unitising can help to multiply tenths by whole numbers.
3. Multiplication of tenths can be represented as repeated addition of tenths.
4. ‘___ times ___ ones is equal to ___ ones so ___ times ___ tenths is equal to ___ tenths’ supports us to multiply tenths.

### Common misconception

Children may incorrectly write the amount of tenths e.g. 49 tenths may be written as 0.49

There are ten tenths in one whole. So e.g. 49 tenths is composed of 4 ones and 9 more tenths. We write this as 4.9

### Keywords

• Tenth - One-tenth is one part in ten equal parts.

### 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).

## Starter quiz

### 6 Questions

Q1.
Continue this sequence: 8 ones, 9 ones, 10 ones, ___ ones
Q2.
Match the equations to their sum.
Correct Answer:3 + 3 + 3 =,9

9

10

Correct Answer:2 + 2 + 2 + 2 =,8

8

Correct Answer:4 + 4 + 4 + 4 =,16

16

Correct Answer:6 + 6 + 6 =,18

18

Q3.
Match the factors to their product.

36

24

32

0

Correct Answer:1 × 4 = ,4

4

Q4.
0.5 cm = mm
Q5.
Match the equation to the missing factor.
Correct Answer:3 × ___ = 21,7

7

Correct Answer:4 × ___ = 12,3

3

Correct Answer:___ × 5 = 30,6

6

Correct Answer:___ × 2 = 18,9

9

Correct Answer:7 × ___ = 56,8

8

Q6.
Which of these are multiples of six?
28
46
62

## Exit quiz

### 6 Questions

Q1.
What comes next in this sequence? 0.8, 0.9, 1.0, ?
Q2.
How many tenths is 0.5 composed of?
Q3.
If 7 × 8 = 56, what does 7 × 0.8 equal?
560
56
0.56
Q4.
Match the equation to its answer.

3.6

Correct Answer:5 × 0.5 = ,2.5

2.5

Correct Answer:3 × 0.7 = ,2.1

2.1

Correct Answer:0.1 × 1 = ,0.1

0.1

Correct Answer:0 × 0.9 = ,0

0

Q5.
Lucas is making a line of marbles. Each marble is 0.8 cm long. How long could it be?