New
New
Year 3

New
New
Year 3

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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

• 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).

## Starter quiz

### 6 Questions

Q1.
Which addition calculation is represented by the base ten blocks?
34 + 35 =
Correct answer: 43 + 35 =
43 + 53 =
34 + 53 =
Q2.
What is the missing sum in the column addition?
Q3.
What is 340 + 100?
Q4.
What is 410 + 70?
Q5.
What is the missing number in the column addition?
Q6.

## Exit quiz

### 6 Questions

Q1.
Which addition calculation is represented by the base ten blocks?
34 + 42 =
24 + 32 =
Correct answer: 124 + 132 =
Q2.
What is the missing sum in the column addition?
Q3.
What is the value of the missing digit in the column addition?