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25 Cards in this Set
- Front
- Back
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Ratio |
A comparison of two (or more) qualities |
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Constant Rate of Change |
The rate of change between any two points in a linear relationship is the same or constant. |
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Rate |
A ratio in which to units of measure are compared |
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How to find discount |
discount = discount rate (%) x cost of item |
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Unit Rate |
The price for one unit of measure |
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Proportion |
an equation stating that two ratios are equal |
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Proportional Relationship |
Proportions are the comparison of two equal ratios. Therefore, proportional relationships are relationships between two equal ratios.a relationship where the ratios between two kinds of values is always the same |
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Scale Factor |
a common ratio for pairs of corresponding sides of similar figures |
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Scale |
the ratio of the size of a figure on a drawing to the actual size of the figure. |
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How to find commission |
commission = commission rate (%) x sales |
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How to find sales tax |
sales tax = tax rate (%) x cost of item(s) |
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How to find interest |
Interest = Principal x rate(%) x time |
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How to find amount |
Amount = Principal + Interest |
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How to find change |
Original amount - new amount |
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How to find percent of change (increase or decrease) |
Change divided by original |
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percent |
part of 100 |
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part |
an amount: example the amount increased, or decreased, or part of the base |
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Percentage |
this is the official name for "part" |
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percent of decrease |
use when a word problem has: decrease, discount, on sale, off, reduce |
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tip |
percent of increase, the amount added to the total given to the waiter |
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mark-up |
percent of increase, the amount added to the total for the store |
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on sale or discount |
percent of decrease, the amount subtracted from the total |
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interest |
I = prt, use when a word problem has: invest, put in the bank, loan, deposit |
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principal |
the base, the starting amount for invested money |
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base |
the number with "of", the original number |
