# Multiply a 2-digit number by a 1-digit number using partitioning and representations (one regroup)

I can use an array to represent multiplication and use place value in an array to represent multiplication of a 2-digit number

# Multiply a 2-digit number by a 1-digit number using partitioning and representations (one regroup)

I can use an array to represent multiplication and use place value in an array to represent multiplication of a 2-digit number

## Slide deck

## Lesson details

### Key learning points

- Partitioning allows us to multiply the tens and then the ones and recombine the products.
- The grid can represent the array.
- Multiply the ones and tens separately and recombine.

### Common misconception

Pupils may not regroup correctly if they do not understand the place value of digits in a factor.

Encourage pupils to use the stem sentences / array to identify when they may need to regroup.

### Keywords

Array - An array is the layout of items (such as objects, numbers, etc.) arranged in rows and/or columns.

Product - The result of two or more values multiplied together.

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

no regrouping

regrouping in ones

regrouping in tens