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

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

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Year 5

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

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

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Lesson details

Key learning points

If the product of the ones digit is greater than 10, you regroup ten ones into one ten.
Record the additional ten or tens as a small digit to be added in with the tens.
Short multiplication results in only one product being recorded.
There are similarities and differences between the expanded recording and short multiplication.

Keywords

Short multiplication - A method using columns to set out and calculate a multiplication is short multiplication.
Regrouping - The process of unitising and exchanging between place values is known as regrouping.

Common misconception

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

Ask children about the additional ten or tens as a small digit to be added in with the tens. What does this show? What is the value?

Ensure pupils can generalise short multiplication results in only one product being recorded. Allow lots of opportunities for pupils to practise the layout and set up of the strategy.

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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).