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10 Cards in this Set
- Front
- Back
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compatible numbers
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Numbers in a problem or related numbers that are easy to work with mentally.
Ex: 720 and 90 are compatible numbers for division because 72 9 = 8 |
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difference
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The answer to a subtraction problem.
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digit
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A symbol used to write numbers.
The ten digits are 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. |
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estimate
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A number close to an exact value. An estimate indicates about how much. Example: 47 + 22 (round to 50 + 20) The estimate is 70.
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expression
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A combination of numbers and operations.
Ex: 4(n + 3) |
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number sentence
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An expression using numbers and the = sign, or the < or > sign.
Ex. 5 + 4 = 9; 8 > 5 |
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round
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To change the value of a number to one that is easier to work with. To find the nearest value of a number based on a given place value.
Example: 27 rounded to the nearest ten is 30. |
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regroup
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To use place value to exchange equal amounts when renaming a number.
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subtraction (subtract)
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An operation that tells the difference, when some or all are taken away.
Example: 9 - 4 = 5 |
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CHAPTER 3
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CHAPTER 3
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