Use column addition to add numbers by regrouping ones | Maths

Starter quiz

13 can be regrouped into…
- 1 ten and 5 ones
- 3 tens and 1 one
- 1 ten and 3 ones ✓
Match each ones numbers to the correct regrouping.
- 11
  
  ⇔
  
  1 ten and 1 one ✓
- 14
  
  ⇔
  
  1 ten and 4 ones ✓
- 41
  
  ⇔
  
  4 tens and 1 one ✓
- 44
  
  ⇔
  
  4 tens and 4 ones ✓
Calculate the missing sum.
- '42' ✓
Calculate the missing number in the column addition.
- '2' ✓
What is the missing sum?
- 260
- 270 ✓
- 273
- 370
What is the missing number in the column addition?
- '9' ✓

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Pupils may regroup incorrectly, forget to write the regrouped ten or forget to add any regrouped tens when calculating the total for the tens column.

Emphasise that the regrouped number is a ten and that it needs to be added to the tens total. If necessary, revisit the use of base ten blocks.

Column addition - Column addition is a way of adding numbers by writing a number below another.
Regroup - Regroup means moving an amount to make a calculation easier.