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7 Cards in this Set
- Front
- Back
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Relative Primes
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Integers that have no common factor other than 1. To determine whether 2 integers are relative primes, break them down to their prime factorization.
ex. 35= 5x7 & 54=2x3x3x3 they have no prime common factors, so they are relative primes. |
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Multiplying Fractions
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Multiply both the numerators and the denominators.
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Adding/Subtracting Fractions
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Find a common denominator, then find the associated numerators. Then add the numerator.
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Finding the Original Whole
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Set up an equation
Ex. After a 5% increase, the population was 59,346. What was the original? 1.05x=59,346 |
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Combined Percent Increase and Decrease
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To determine tho combined effect of multiple percent increases/ decreases, start with 100 and see what happens.
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Using the Average Formula to find the Sum
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Sum= (Average)x(# of Terms)
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Finding the Missing Number
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When given the average, use the sum. If the average of 4 #s is 7, then the sum is 4x7 or 28. Suppose that 3 #s are 3, 5, & 8. these 3 #s add up to 16. this leaves12 as the 4th #
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