New
New
Year 3

Add 3-digit numbers using column addition

I can add 3-digit numbers using column addition.

New
New
Year 3

Add 3-digit numbers using column addition

I can add 3-digit numbers using column addition.

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Lesson details

Key learning points

  1. When using column addition, start by adding numbers with the smallest place value first.
  2. Use zero to show that there are no tens or ones in a 3-digit number.
  3. Partition each number carefully into hundreds, tens and ones.

Common misconception

Pupils may not use zero to show that there are no tens or ones number in a 3-digit number. They may also use a zero to show that there are no hundreds when adding a 2-digit to a 3-digit number.

Emphasise with pupils that they need to use a zero only when needed. The number 75 would not be written as 075, so should not be written like this in column addition.

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.

Base ten blocks may be useful for some pupils in helping understand column addition with three digits. The number cards 0-5 will also be needed for task B.
Teacher tip

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.
Which addition calculation is represented by the base ten blocks?
An image in a quiz
34 + 35 =
Correct answer: 43 + 35 =
43 + 53 =
34 + 53 =
Q2.
What is the missing sum in the column addition?
An image in a quiz
Correct Answer: 49
Q3.
What is 340 + 100?
Correct Answer: 440
Q4.
What is 410 + 70?
Correct Answer: 480
Q5.
What is the missing number in the column addition?
An image in a quiz
Correct Answer: 2
Q6.
What is the missing addend in this column addition?
An image in a quiz
Correct Answer: 40

6 Questions

Q1.
Which addition calculation is represented by the base ten blocks?
An image in a quiz
34 + 42 =
24 + 32 =
Correct answer: 124 + 132 =
Q2.
What is the missing sum in the column addition?
An image in a quiz
Correct Answer: 733
Q3.
What is the value of the missing digit in the column addition?
An image in a quiz
Correct Answer: 7
Q4.
What is the missing digit in the column addition?
An image in a quiz
Correct Answer: 6
Q5.
What are the missing digits in the addend in the column addition?
An image in a quiz
Correct answer: 1 and 3
4 and 6
2 and 2
Q6.
What is the missing addend?
An image in a quiz
Correct Answer: 157