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Number line |
a diagram that represents numbers as points on a line |
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Number sense |
a person’s ability to use and understand numbers |
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Decompose |
to separate a number into 2 or more parts |
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Regroup |
to rearrange the formation of a group |
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Expanded form |
a number written as a sum of the place values |
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Place value |
the value of a digit based on its location |
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Standard algorithm |
a step by step procedure for computing that gives the correct result in every case when the steps are carried out correctly |
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Difference |
the answer to a subtraction problem |
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Subtraction |
An operation that gives the differences between two numbers. Subtraction can be used to compare two numbers, or to find out how much is left after some is taken away. |
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Adding up strategy |
strategy used for subtracting by adding up from the number being subtracted to the whole |