New
New
Add 2-digit numbers using column addition
I can add 2-digit numbers using column addition.
Lesson 3 of 10
New
New
- Year 3
Add 2-digit numbers using column addition
I can add 2-digit numbers using column addition.
Lesson details
Key learning points
- The addends are written in columns with the same value digits in the same column
- Start by adding numbers with the smallest place value first
- Record the sum below the addends
Keywords
Addend - An addend is a number added to another.
Sum - The sum is the the total when numbers are added together.
Column addition - Column addition is a way of adding numbers by writing a number below another.
Common misconception
Pupils may refer to adding numbers in the tens as 3 + 6 rather than 30 + 60
Encourage them to refer to the tens numbers as tens, and use the language appropriately. In 34 + 44, we add 4 and 4 together and then we add 30 and 40 together. This will support their reasoning as they progress in this unit.
Base ten blocks may be useful to help children represent and understand column addition. Ensure that children understand that they start by adding the numbers on the right first - avoid saying 'start with the ones' as in upper key stage 2 they will be adding decimal numbers using column addition.
Teacher tip
Licence
This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What is represented by the digit 5 in 56?
What is represented by the digit 5 in 56?
5
500
Q2.What is represented by the digit 2 in 256?
What is represented by the digit 2 in 256?
2
20
Q3.Which calculation matches the base ten blocks representation?
Which calculation matches the base ten blocks representation?
123 + 54
133 + 44
134 + 45
Q4.Which calculation matches the base ten blocks representation?
Which calculation matches the base ten blocks representation?
133 + 144
134 + 143
145 + 134
Q5.Which calculation matches the column addition?
Which calculation matches the column addition?
124 + 131
214 + 131
224 + 121
Q6.Which two numbers are being added in the column addition?
Which two numbers are being added in the column addition?
two hundred and three
two hundred and sixty
Assessment exit quiz
6 Questions
Q1.Which addition calculation is represented by the base ten blocks?
Which addition calculation is represented by the base ten blocks?
42 + 36
33 + 46
32 + 44
Q2.Which two addends are added in this column addition?
Which two addends are added in this column addition?
thirty-four
sixty-seven
Q3.What is the missing sum in the column addition?
What is the missing sum in the column addition?
Q4.What is the missing sum in the column addition?
What is the missing sum in the column addition?
Q5.What ones digit is missing from this column addition?
What ones digit is missing from this column addition?
Q6.What is the missing addend in this column addition?
What is the missing addend in this column addition?
