Add 3-digit numbers using column addition | Maths | Quizalize & Oak National Academy

Starter quiz

Which addition calculation is represented by the base ten blocks?

34 + 35 =

43 + 35 = ✓

43 + 53 =

34 + 53 =
What is the missing sum in the column addition?

'49' ✓
What is 340 + 100?

'440' ✓
What is 410 + 70?

'480' ✓
What is the missing number in the column addition?

'2' ✓
What is the missing addend in this column addition?

'40' ✓

Exit quiz

Which addition calculation is represented by the base ten blocks?

34 + 42 =

24 + 32 =

124 + 132 = ✓
What is the missing sum in the column addition?

'733' ✓
What is the value of the missing digit in the column addition?

'7' ✓
What is the missing digit in the column addition?

'6' ✓
What are the missing digits in the addend in the column addition?

1 and 3 ✓

4 and 6

2 and 2
What is the missing addend?

'157' ✓

Worksheet

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Presentation

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Video

Lesson Details

Key learning points

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