Year 3 have recently learnt how to add two numbers using column addition. Column addition is a great method for when we aren’t able to use reasoning and mental maths to help us add numbers together.
Top tips:
- Use HTO to help you line up your numbers.
- Use one digit per box to keep it neat and tidy.
- Always start adding from the smallest value column!
This is what your working out might look like if each column adds up to 9 or less.
We have then learnt what to do if a column totals 10 or more! We use these facts to help us:
10 ones = 1 ten
10 tens = 1 hundred
We must exchange the 10 ones for 1 ten and mark it underneath our answer box and do the same for 10 tens exchanged for 1 hundred.
Here’s some of our work!
Help at home by practising this method. Can you add two 3-digit numbers using column addition?