Review using column subtraction with regrouping from hundreds to tens

I can use column subtraction, including regrouping from the hundreds to tens.

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Year 4

Review using column subtraction with regrouping from hundreds to tens

I can use column subtraction, including regrouping from the hundreds to tens.

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Share activities with pupils

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Lesson details

Key learning points

Regroup when the ones or tens digit of the subtrahend is greater than the ones or tens digit of the minuend.
Regroup a ten into 10 ones.
Regroup a hundred into 10 tens.
If the tens digit of the minuend is a zero, you need to regroup the hundreds before you can regroup the tens.

Keywords

Column subtraction - Column subtraction is a way of subtracting numbers by writing a number below another.
Regroup - The process of unitising and exchanging between place values is known as regrouping.

Common misconception

Pupils may not think regrouping is needed if the tens are the same digit, but regrouping in the ones can mean regrouping in the tens.

Share examples where regrouping 1 ten as 10 tens means that regrouping is also needed in the tens (e.g. 345 - 148).

Pupils may need to see several examples using Base 10 blocks where there is regrouping in both the tens and the ones. Ensure that pupils refer to the size of the digits when they are using column subtraction. Does the 6 represent 6 ones, 6 tens or 6 hundreds?