Rates as Ratios
Concept
The Big Idea
A ratio compares two amounts. A unit rate is a ratio with in the second slot, which makes scaling up easy: just multiply.
Example
Scaling a recipe
If grams of sugar go with one cup of flour, then cups need grams.
In Plain Terms & More Examples
Concept
In plain terms
A ratio compares two amounts. A unit rate rewrites it with in the second slot, which makes scaling as simple as multiplying.
Example
A pay rate
If is earned in hours, the unit rate is per hour.
Example
Scaling a ratio
The ratio scaled up by becomes .