Review using column addition to add 2- and 3-digit numbers by regrouping ones | Maths

Starter quiz

1. What is the sum in this column addition?
- '88' ✓
What is the sum in this column addition?
- '363' ✓
What tens digit is missing from this column addition?
- '4' ✓
What hundreds digit is missing from this column addition?
- '6' ✓
Match the pairs of addends with the correct sum.
- 55 + 22 =
  
  ⇔
  
  77 ✓
- 61 + 22 =
  
  ⇔
  
  83 ✓
- 22 + 42 =
  
  ⇔
  
  64 ✓
- 22 + 37 =
  
  ⇔
  
  59 ✓
Which two addends complete the column addition?
- 204 ✓
- 314
- 334
- 434 ✓

Exit quiz

In which column addition calculations do you need to regroup in the ones?
- A ✓
- B
- C
- D ✓
What is the sum in the column addition?
- '62' ✓
What is the sum in the column addition?
- '252' ✓
Which ones digit is missing from this column addition?
- '5' ✓
Which ones digit is missing from this column addition?
- '7' ✓
Match up the 2-digit numbers so that each pair has a sum of 83
- 44
  
  ⇔
  
  39 ✓
- 25
  
  ⇔
  
  58 ✓
- 36
  
  ⇔
  
  47 ✓
- 57
  
  ⇔
  
  26 ✓

Worksheet

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Presentation

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Lesson Details

Key learning points

When using column addition, start by adding the numbers with the smallest place value first.
If the sum of the ones digits is ten or greater, regrouping is needed.
Any complete tens are regrouped into the tens column.

Common misconception

Pupils may not regroup ones into the tens column.

Model regrouping from the ones to the tens. Encourage pupils to consider the size of the numbers, thinking about an approximate sum of the two addends. Is their answer reasonable?

Keywords

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.