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

I can use expanded multiplication to record regrouping from the 1s to the 10s

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

I can use expanded multiplication to record regrouping from the 1s to the 10s

## Slide deck

## Lesson details

### Key learning points

- If the product of the ones digits is greater than 10, you regroup ten ones into one ten.
- If the product of the ones digits is greater than ten, the partial product will be a 2-digit number.
- There are similarities between the representations of multiplication.

### Common misconception

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

Continue to ask what each digit that has been recorded represents. Demonstrate the regrouping using base ten blocks to help.

### Keywords

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

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

### 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

13 × 3

3 × 14

3 × 11