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Compute unit rates associated with ratios of fractions.
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A unit rate tells how much of one quantity per 1 unit of another.
With fractions, divide the numerator fraction by the denominator fraction.
Example: A snail travels mile in hour. What is its speed?
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In a proportional relationship , the constant of proportionality is the unit rate.
| 2 | 6 | 3 |
| 4 | 12 | 3 |
| 5 | 15 | 3 |
, so
A relationship is proportional if:
Real world: Recipes, maps, currency exchange, and speed are all proportional relationships!