Decimal Form Of Rational Numbers Worksheet - Chapter 2.2, Mathlink 9, Mcgraw-Hill Ryerson School
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82.2
Problem Solving With Rational
Numbers in Decimal Form
Focus on…
After this lesson, you
will be able to…
•
perform operations
on rational numbers
in decimal form
•
solve problems
involving rational
numbers in decimal
form
In Regina, Saskatchewan, the average mid-afternoon temperature in
Did You Know?
January is -12.6 °C. The average mid-afternoon temperature in July is
As Canada’s sunniest
26.1 °C. Estimate how much colder Regina is in January than in July.
provincial capital,
Regina averages
almost 6.5 h of
Explore Multiplying and Dividing Rational Numbers in
sunshine per day.
Decimal Form
That is over 2 h per
day more sunshine
Estimate the products and quotients. Explain your method.
1. a)
than St. John’s,
Newfoundland and
3.2 × 4.5
3.2 × (-4.5)
-20.9 ÷ 9.5
-20.9 ÷ (-9.5)
Labrador. St. John’s is
Calculate the products and quotients in part a). Explain your method.
b)
the least sunny
provincial capital.
Suppose the temperature one January afternoon in Regina decreased
2. a)
by 2.6 °C every hour for 3.5 h. What was the overall temperature
change during that time?
Suppose the temperature in Regina one July afternoon increased by
b)
9.9 °C in 5.5 h. What was the average temperature change per hour?
Refl ect and Check
How can you multiply and divide rational numbers in decimal form?
3.
Create a problem that can be solved using the multiplication or division
4.
of rational numbers. Challenge a classmate to solve it.
2.2 Problem Solving With Rational Numbers in Decimal Form • MHR
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