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Quehl math voc.ch.2

Quehl math vocabulary chapter 2

addends numbers added together to give a sum
sum the answer when adding two or more addends
commutative (order) property of addition numbers can be added in any order and the sum will be the same
associative (grouping) property of addition the grouping of addends can be changed and the sum will be the same
identity (zero) property of addition the sum of any number and zero is that same number
fact family a group of related facts using the same numbers
difference the answer when subtracting two or more numbers
estimate to give an approximate answer or number
rounding replacing a number with a number that tells about how much or how many to the nearest ten, hundred, thousand, and so on
front-end estimating a way to estimate a sum or difference by using the first digit of each number
compatible numbers numbers that are easy to add, subtract, multiply or divide mentally
overestimate an estimate that is greater than the exact number
underestimate an estimate that is less than the exact number
Created by: wildflower