# Rate

A Rate is a division quotient based on the comparison of values from different scales (one of them typically being time).

**Context:**- It must have a Unit of Measure.

**Example(s):**- 5 km/hr
- any Acceleration Rate.
- any Error Rate.
- a 76% Labor Participation Rate.

**See:**Rating, Proportion.

## References

### 2009

- (WordNet, 2009) ⇒ http://wordnetweb.princeton.edu/perl/webwn?s=rate
- S: (n) rate (a magnitude or frequency relative to a time unit) "they traveled at a rate of 55 miles per hour"; "the rate of change was faster than expected"
- S: (n) rate, charge per unit (amount of a charge or payment relative to some basis) "a 10-minute phone call at that rate would cost $5"
- S: (n) pace, rate (the relative speed of progress or change) "he lived at a fast pace"; "he works at a great rate"; "the pace of events accelerated"
- S: (n) rate (a quantity or amount or measure considered as a proportion of another quantity or amount or measure) "the literacy rate"; "the retention rate"; "the dropout rate"
- S: (v) rate, rank, range, order, grade, place (assign a rank or rating to) "how would you rank these students?"; "The restaurant is rated highly in the food guide"
- S: (v) rate (be worthy of or have a certain rating) "This bond rates highly"
- S: (v) rate, value (estimate the value of) "How would you rate his chances to become President?"; "Gold was rated highly among the Romans"

- http://www.mathleague.com/help/ratio/ratio.htm
- A rate is a ratio that expresses how long it takes to do something, such as traveling a certain distance. To walk 3 kilometers in one hour is to walk at the rate of 3 km/h. The fraction expressing a rate has units of distance in the numerator and units of time in the denominator.

Problems involving rates typically involve setting two ratios equal to each other and solving for an unknown quantity, that is, solving a proportion.

### 2000

- Math.com. (2000). “Glossary, http://www.math.com/school/glossary/defs/rate.html
- rate: A ratio that compares different kinds of units.

- Math.com (2000). “Ratios and Proportions.” http://www.math.com/school/subject1/lessons/S1U2L3GL.html
- A rate is a ratio that compares two different kinds of numbers, such as miles per hour or dollars per pound. A unit rate compares a quantity to its unit of measure. A unit price is a rate comparing the price of an item to its unit of measure. The rate "miles per hour" gives distance traveled per unit of time. Problems using this type of rate can be solved using a proportion, or a formula.