Ratios And Rates Worksheet - Chapter 3 Page 21
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383.4
Using Rates
YOU WILL NEED
•
a calculator
Use rates and equivalent rates to solve problems.
LEARN ABOUT
the Math
speed
the rate at which a
Adam Sioui of Calgary won a gold medal in 2007 for swimming
moving object travels
the 100 m backstroke in just under 56 s.
a certain distance in a
certain time; for
example, a sprinter
who runs 100 m in
On average, how long did
10 s has a speed of
Adam take to swim 1 m?
100 m/10 s
10 m/s.
Speed is an example of a rate.
A.
It compares the distance travelled
rate
to the time in which the distance is
a comparison of two
travelled. How do you know that
amounts measured in
Adam’s speed was less than two
different units; for
metres each second?
example, cost per item
or distance compared
Describe how you would calculate
B.
to time. The word “per”
Adam’s speed as a unit rate of metres
means “to” or “for
per second (m/s).
each” and is written
using a slash (/); for
C.
How do you know that Adam swam 1 m
example, a typing rate
in less than 1 s?
of 250 words/8 min.
D.
What is Adam’s unit rate in seconds per
metre (s/m)?
unit rate
a rate in which the
second term is 1; for
Tip
Communication
example, in swimming,
12 laps/6 min can be
The 1 in a unit rate is usually not written;
rewritten as a unit rate
e.g., 95.2 km/1 h is written as 95.2 km/h.
of 2 laps/min
122
Chapter 3
NEL
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