New
New
Year 3

Add 2-digit numbers using column addition

I can add 2-digit numbers using column addition.

New
New
Year 3

Add 2-digit numbers using column addition

I can add 2-digit numbers using column addition.

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Lesson details

Key learning points

  1. The addends are written in columns with the same value digits in the same column
  2. Start by adding numbers with the smallest place value first
  3. Record the sum below the addends

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.

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.

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

Video

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6 Questions

Q1.
What is represented by the digit 5 in 56?
5
Correct answer: 50
500
Q2.
What is represented by the digit 2 in 256?
2
20
Correct answer: 200
Q3.
Which calculation matches the base ten blocks representation?
An image in a quiz
123 + 54
133 + 44
134 + 45
Correct answer: 133 + 54
Q4.
Which calculation matches the base ten blocks representation?
An image in a quiz
133 + 144
134 + 143
Correct answer: 135 + 143
145 + 134
Q5.
Which calculation matches the column addition?
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124 + 131
214 + 131
224 + 121
Correct answer: 224 + 131
Q6.
Which two numbers are being added in the column addition?
An image in a quiz
two hundred and three
Correct answer: two hundred and thirty
two hundred and sixty
Correct answer: two hundred and six

6 Questions

Q1.
Which addition calculation is represented by the base ten blocks?
An image in a quiz
42 + 36
Correct answer: 32 + 46
33 + 46
32 + 44
Q2.
Which two addends are added in this column addition?
An image in a quiz
Correct answer: twenty-four
thirty-four
Correct answer: forty-three
sixty-seven
Q3.
What is the missing sum in the column addition?
An image in a quiz
Correct Answer: 63, sixty-three
Q4.
What is the missing sum in the column addition?
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Correct Answer: 78, seventy-eight
Q5.
What ones digit is missing from this column addition?
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Correct Answer: 2, two
Q6.
What is the missing addend in this column addition?
An image in a quiz
Correct Answer: 20, twenty