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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