# Multiply a 2-digit number by a 1-digit number using expanded multiplication (regrouping 10s to 100s)

I can use expanded multiplication to record regrouping from the 10s to the 100s.

# Multiply a 2-digit number by a 1-digit number using expanded multiplication (regrouping 10s to 100s)

I can use expanded multiplication to record regrouping from the 10s to the 100s.

## Slide deck

## Lesson details

### Key learning points

- If the product of the single digit and the tens number is greater than 100 then you regroup ten tens into one hundred.
- If the product of the single digit and the tens number is greater than 100 the partial product will be a 3-digit number.
- There are similarities between the representations of multiplication.

### Common misconception

Pupils may not align or regroup correctly leading to an inaccurate calculation.

Model accurately what happens when we regroup from 10s to 100s. Why did this happen? How do we record this?

### Keywords

Expanded multiplication - Expanded multiplication is a way of recording the steps 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

0 regroup

Regrouping in 1s to 10s

Regrouping in 10s to 100s