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

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

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Lesson 9 of 10

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Year 5

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

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

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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.
Record the additional hundred or hundreds in the hundreds column, one column to the left of the tens digits.
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.
Regroup - 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.

Reiterate that if the product of the single digit and the tens number is greater than 100 then you regroup ten tens into one hundred.

Ensure children can record the additional hundred or hundreds in the hundreds column, one column to the left of the tens digits. Allow lots of opportunities for independent recording.

Teacher tip

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This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).