NSES Content Standard Unifying Concepts
and Processes:
Constancy, change, and measurement Grades K-12, page 118 Rate involves comparing one measured quantity to another measured quantity,
for example, 60 meters per second. Rate is also a measure of change for
a part relative to the whole, for example, change in birth rate as part
of population growth.
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Benchmark 9B The Mathematical World:
Symbolic Relationships
Grades 9-12, page 220
In some cases, the more of something there is, the more rapidly it
may change (as the number of births is proportional to the size of the
population). In other cases, the rate of change of something depends on
how much there is of something else (as the rate of change of speed is
proportional to the amount of force acting).
Benchmark 11C Common Themes: Constancy
and Change
Grades 6-8, page 274
Symbolic equations can be used to summarize how the quantity of something
changes over time or in response to other changes.