Subtract/səbˈtrækt/ Definition 1 of 2Pro Tip 1/3Math Operations Used mainly for describing actions in basic math calculations. Children learn how to subtract numbers in elementary school. Pro Tip 2/3Beyond Numbers Can describe reducing anything in quantity, not just numerical values. If you subtract three apples from the basket, how many are left? Pro Tip 3/3Negative Result Subtracting a larger number from a smaller one gives a negative result. Subtract 5 from 3, and you end up with negative two.