In Primary 3 we use a variety of methods to explore subtraction and it is natural to prefer one method over another. We use number line to count back and also to find the difference by ‘adding up’ from the small number to the bigger. We also use place value ‘Hundreds, Tens and Units’.

We use part-whole models and base 10 to help visualise the numbers. Please find more details below. It includes a video (hopefully it works) and written explanation.

Hope this helps!

Miss Caldwell