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7 Cards in this Set

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  • Back
Commutative Property
when adding the order of the number can change but the sum is the same.

3 + 4 = 7 4 + 3 = 7
addend
a number to be added

3 + 4 = 7
addend addend
estimate
to find an answer that is close to the exact answer

321 + 189 is about
300 + 200 = 500
regroup
to name a number in a different way

18 ones as 1 ten 8 ones
Identity Property
When one of the two addends is zero, the sum is the same as the other addend.

7 + 0 = 7
pattern
a series of numbers that follows a rule
3 + 4 = 7
30 + 40 = 70
300 + 400 = 700
Associative Property
When adding, the grouping of numbers can change but the sum is the same.

3+(4 + 2)=9 (3+4)+2=9