What is subtraction?
Subtraction finds what is left when one amount is taken away, or the difference between two amounts. 9 − 4 can be solved by counting back four from 9, or by counting up from 4 to 9; with larger numbers, columns are exchanged ("borrowing") when the top digit is smaller.
- Subtract by counting back from the larger number
- Use one addition fact to find the related subtraction facts