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15 Cards in this Set
- Front
- Back
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decimal
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a number that names a whole and part of a whole
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tenth
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the first place to the right of the decimal. ex: .1
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hundredth
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the second place to the right of the decimal. ex: .01
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thousandth
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the third place to the right of the decimal. ex: 001
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ten-thousandth
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the fourth place to the right of the decimal. ex: .0001
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billion
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1,000 million
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estimate
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to find a number that is close to an exact amount
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front-end estimation
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an estimation that is made by adding or subtracting the value of the front digits of each number
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expression
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a mathematical phrase that combines numbers, operation signs, and sometimes variable; it does not have an equal sign
ex: n + 4 |
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variable
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a letter or symbol that stands for one or more numbers
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equation
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an algebraic or numberical sentence that shows two quantities are equal
ex: n + 7 = 11 |
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solution
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a value that, when substituted for the variable, makes an equation or an inequality true
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inequality
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a number sentence that shows that two amounts are not equal
ex: n + 6 < 9 |
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commutative property
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reordering the addends, does not change a sum
ex: 4 + 3 + 7 = 3 + 7 + 4 |
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associative property
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regrouping the addends, does not change a sum
ex: (25 + 5) + 17 = 25 + (5 + 17) |
