Review using column subtraction with regrouping from hundreds to tens | Maths

Starter quiz

Which calculations need regrouping from the tens to the ones?
- A
- B ✓
- C ✓
Complete the column subtraction. What is the difference between the two numbers?
- '18' ✓
Complete the column subtraction. What is the difference between the two numbers?
- '234' ✓
Find the missing difference in the column subtraction.
- '216' ✓
Find the missing ones digit in the column subtraction.
- '5' ✓
Find the missing ones digit in the column subtraction.
- '9' ✓

Where is regrouping needed in this column subtraction?
- Regrouping is needed in the ones. ✓
- Regrouping is needed in the tens.
- Regrouping is needed in the ones and tens.
- Regrouping is not needed.
Where is regrouping needed in this column subtraction?
- Regrouping is needed in the ones.
- Regrouping is needed in the tens.
- Regrouping is needed in the ones and tens. ✓
- Regrouping is not needed.
Complete the column subtraction. What is the difference between the two numbers?
- '52' ✓
Calculate the difference.
- '189' ✓
Calculate the difference.
- '95' ✓
Calculate the difference.
- '267' ✓

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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.

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).

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.