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HSP Chapter 2

estimate a number close to an exact amount
compatible numbers numbers that are easy to compute mentally
fact family a set of related multiplication and division, or addition and subtraction equations
inverse operations operations that undo each other Addition and subtraction are inverse operations.
round to replace a number with another number that tells about how many or how much
front-end estimation a method of estimating a sum or difference by using the front digit of the number and substituting zeros for the other digits
regroup to exchange amounts of equal value to rename a number
sum the answer to an addition problem
difference the answer to a subtraction problem
Created by: mrsodenbach