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10 Cards in this Set
- Front
- Back
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Real Numbers
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Any number on the number line (-3 -2 -1 0 1 2 3) Can be a rational or irrational number.
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Rational Numbers
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Real number that can be written as a fraction, terminating decimal (eg 0.25), or repeating decimal (eg 0.212121...)
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Irrational Numbers
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Numbers that cannot be written as a fraction. (Square roots, cube roots, and pi, though not ALL square roots are irrational)
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Percent Increase
(eg: An amount goes up from 20 to 45... What is the % increase?) |
(New Value - Original Value / Original Value ) Multiplied by 100
( 45 - 20 = 25 / 20 = 1.25 x 100 = 12.5% Increase ) |
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Percent Decrease
(eg: An amount of 50 decreases by 5.. What is the %I Decrease?) |
(Original Value - New Value / Original Value) Multiplied by 100
( 50 - 45 = 5 / 50 = 0.1 x 100 = 10% decrease) |
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Convert Fractions to Decimals
(Eg: 3/125) |
Divide 3.00 by 125
0.024 |
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Fractions with power of 10 denominators to decimal
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1/10 = 0.1
1/100 = 0.01 1/1000 = 0.001 1/10000 = 0.0001 1/100000 = 0.00001 |
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Convert 1/5 to decimal
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1/5 --> 2/10 = 0.2
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Convert Decimals to Fractions
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eg: 0.025 = 25 / 1000
0.25 = 25 / 100 0.0025 = 25 / 10000 Rewrite in simplest form: 25 / 25 = 1 1000 / 25 = 40 = 1/40 |
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Convert Fractions to Percents
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eg 5/8 to percents
1) Convert to decimal = 0.625 2) Multiply by 100 and add % sign = 62.5% |
