Year 3

# Using arrays to multiply a 2 digit number by a 1 digit number

Year 3

# Using arrays to multiply a 2 digit number by a 1 digit number

## Slide deck

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## Lesson details

### Key learning points

- In this lesson, we will learn to multiply 2 digit numbers by 1 digit numbers using arrays. We will construct suitable arrays to represent a number, and partition them to make a multiplication calculation clearer.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

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### 5 Questions

Q1.

What does the word 'derive' mean?

Divide

Use the inverse

Q2.

Which of the following are strategies for deriving facts?

Doubling

Halving

Multiplication and division are inverse operations

Multiplication is commutative

Place value

Q3.

Which fact can be derived from 2 x 4 = 8

4 x 5 = 20

4 x 8 = 2

Q4.

What fact can be derived from 6 divided by 2 is equal to 3?

2 + 3 = 5

6 multiplied by 2 is equal to 3

Q5.

Which fact can be derived from 4 x 6 = 24?

2 + 6 = 8

40 x 2 = 80

### 6 Questions

Q1.

Which is an example of partitioning?

10 divided by 2

6 x 3

Q2.

Partitioning makes multiplying two digit numbers easier.

False

Q3.

13 x 5 =

45

55

Q4.

17 x 3 =

121

24

Q5.

18 x 4 =

76

84

Q6.

Use what you know about place value to work out 180 x 4 =

760

840