Use column addition with regrouping in ones and tens | Maths

Starter quiz

170 can be regrouped into…
- 1 ten and 7 hundreds
- 1 ten and 70 ones
- 1 hundred and 7 ones
- 1 hundred and 7 tens ✓
9 + 8 = ______
- '17' ✓
What number is missing from this column addition?
- '4' ✓
What is the sum of the two numbers?
- 126
- 143
- 146 ✓
- 166
What number is missing from this column addition?
- '7' ✓
What tens digit is missing from this column addition?
- '9' ✓

Where will regrouping be needed in this column addition?
- In the tens only ✓
- In the ones only
- In the tens and the ones
- Regrouping will not be needed
Where will regrouping be needed in this column addition?
- In the tens only
- In the ones only
- In the tens and the ones ✓
- Regrouping will not be needed
Jun has started this column addition. Complete it to find the sum.
- '154' ✓
The same digit is missing from both boxes. What is the number?
- '9' ✓
What is the missing tens digit?
- '7' ✓
What is the missing sum?
- '521' ✓

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When using column addition, start by adding the numbers with the smallest place value first.
Make sure that any regrouped 10s are added with the values in the tens column.
Make sure that any regrouped 100s are added with the values in the hundreds column.

Pupils may forget to refer to the size of the numbers when adding and when regrouping.

Encourage pupils to talk about the place value of the digits. Ten ones can be regrouped as a ten; ten tens can be regrouped as a hundred.

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