Fractions, Decimals, Percents Flashcards
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For adding & subtracting fractions, first find a common denominator (Least Common Multiple of 3 and 5)
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Multiply horizontally:
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Dividing fractions: Flip the 2nd fraction and multiply
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When we take the RECIPROCAL, we flip the fraction
This is the same as 1 divided by the fraction.
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Write “z is x percent of y” as an equation
Percent means “divide by 100”
“of” means “multiply”
“is” means =
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Write “x is 20% greater than y” as an equation
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Write “x is 15% less than y” as an equation,
a) write using a decimal
b) convert to a fraction
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Write “x is n percent greater than y” as an equation
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A bike was $50, and is now on sale for $32. What is the percent change in price?
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Distribute:
-3(x-7)
= -3*x + -3*-7
= -3x + 21
Be careful with your SIGNS! Double negative turns into a positive
Factor out the Common Factor:
4x + 4y =7
Both terms have “4” as a factor.
So, we can factor it out (this is the inverse process to “distribution”)
4(x+y) = 7