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9 Cards in this Set

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addend
any one of a set of numbers to be added
Ex. 22+51
align
to bring into a straight line, line up
Ex. 562+135 -> 562
+135
estimate
to find an answer that is close to the exact answer, often based on rounding
mental math
a strategy used when computations can be solved in the mind
missing addend
an unknown addend in addition
Ex. 8+__ =15
regroup
rearrange the formation of a group- used when trading or carrying in addition and subtraction. Ex. 1
47
+25
2
rounding
* to approximate a number by replacing it with a number expressed in tens, hundreds, thousands, and so on.
sum
the answer in addition
tens
* something numbered ten or having ten units
* the place in between the ones and hundreds Ex. 893