# Multiply a 3-digit by a 1-digit number with multiple regroups

I can multiply a 3-digit by a 1-digit number using expanded and short multiplication (multiple regroups).

# Multiply a 3-digit by a 1-digit number with multiple regroups

I can multiply a 3-digit by a 1-digit number using expanded and short multiplication (multiple regroups).

## Slide deck

## Lesson details

### Key learning points

- If the product of the ones digits is greater than 10 then you regroup ten ones into one ten.
- If the product of the 1-digit number and the tens digit is greater than 100 then you regroup ten 10s into one 100
- If the product of the 1-digit number and the 100s digit is greater than 1,000 then you regroup ten 100s into one 1,000

### Common misconception

Incorrectly regrouping or forgetting to record a regrouped amount.

Clear teacher modelling. 'What does this digit represent?' 'Where do we place the regrouped amount?'

### Keywords

Short multiplication - A way of recording using columns to set out and calculate a multiplication.

Expanded multiplication - A way of recording the steps of a calculation focusing on partitioning one or more factors and showing partial products.

Regroup - The process of unitising and exchanging between place values is known as regrouping.

### 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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## Worksheet

## Starter quiz

### 6 Questions

## Exit quiz

### 6 Questions

9

28

49

72

27

600 + 9

600 + 30 + 18

1000 + 15

1000 + 50 + 30