Subtraction of Whole Numbers

algorithm: a set of routine steps used to solve problems.

difference: the result of subtraction.

estimate (noun): a close guess made using mathematical thinking.

estimate (verb): to give an approximate number or answer based on mathematical thinking.

reasonable: something that makes sense when given facts are taken into account.

regroup: to compose or decompose ones, tens, hundreds, thousands, and so forth.

sum: the result of addition.

Subtraction Strategies