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10 Cards in this Set
- Front
- Back
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addends |
the numbers being added together |
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mental math |
is a way of doing math in your head |
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unknown |
is a missing number |
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reasonableness |
when an answer makes sense |
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Associative Property of Addition |
states that you can change the grouping of the addends and still get the same sum
(1+4) + 3 = 1 + (4 + 3) |
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sum |
the answer to an addition problem |
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Identity Property of Addition |
states when you add zero to any number, the sum is that number 5 + 0 = 5 |
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Cummutative Property of Addition |
states that the order in which numbers are added does not change the sum 1 + 2 = 2 +1 |
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regroup |
means to rename a number by using place value |
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parentheses |
tell you which numbers to add together first |
