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HSP Chapter 2
Question | Answer |
---|---|
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 |