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Definition
| A digit is any symbol used to write whole numbers. The numbers 0, 1, 2,3,4,5,6,7,8,9 are all digits. |
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Term
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Definition
| The place value of a digit tells what value it has in a number. For example in the number 12, 2 is in the ones place. |
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Term
| Four-step plan to solve problems |
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Definition
| Understand (the problem), Plan (how to solve), Solve (work out the problem), Check (check your answer to be sure it is correct). |
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Definition
| To round is to change the vaule of a number to one that is easier to work with. |
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Term
| Associate Property of Addition |
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Definition
The property which states that the grouping of the addends does not change the sum.
Example: (4+5) + 2 = 4 + (5+2) |
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Term
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Definition
| A symbol placed after the number to indicate cent. |
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Term
| Commutative Property of Addition |
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Definition
The property that states that the order in which two numbers are added does not change the sum.
Example: 12 + 15 = 15 + 12 |
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Term
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Definition
Numbers in a problem or related numbers that are easy to work with mentally.
Example 720 and 90 are compatible numbers for division because 72 divided by 9 = 8. |
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Term
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Definition
A number close to an exact value; an estimate indicates about how much.
Example: 47 + 22 (estimate 50 + 20) about 70. |
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| Identity Property of Addition |
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Definition
If you add zero to a number, the sum is the same as the given number.
Example 3 + 0 = 3 |
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Term
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Definition
| To use place value to exchange equal amounts when renaming a number. |
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