Decimal Form Of Rational Numbers Worksheet - Chapter 2.2, Mathlink 9, Mcgraw-Hill Ryerson School Page 7
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8In dry air, the temperature decreases by
A company made a profi t of $8.6 million in
15.
19.
about 0.65 °C for each 100-m increase
its fi rst year. It lost $5.9 million in its second
in altitude.
year and lost another $6.3 million in its
third year.
The temperature in Red Deer, Alberta,
a)
is 10 °C on a dry day. What is the
What was the average profi t or loss per
a)
temperature outside an aircraft 2.8 km
year over the fi rst three years?
above the city?
The company broke even over the fi rst
b)
The temperature outside an aircraft
four years. What was its profi t or loss in
b)
1600 m above Red Deer is -8.5 °C.
the fourth year?
What is the temperature in the city?
Research to fi nd out the current price of
20.
Bella is more comfortable working with
gasoline in Calgary. It is 300 km from
16.
integers than with positive and negative
Calgary to Edmonton. How much less
decimal numbers. This is her way of
would it cost to drive this distance in a car
understanding -4.3 + 2.5.
with a fuel consumption of 5.9 L/100 km
-43
than in a car with a fuel consumption of
____
-4.3 is
or -43 tenths.
10
9.4 L/100 km? Give your answer in dollars,
25
___
expressed to the nearest cent.
2.5 is
or 25 tenths.
10
-43 tenths + 25 tenths is -18 tenths.
-18
___
-18 tenths is
or -1.8.
10
So, -4.3 + 2.5 = -1.8.
Use Bella’s method to determine
a)
6.1 + (-3.9).
How could you modify Bella’s method to
b)
determine 1.25 - 3.46?
Two wooden poles measured 1.35 m and
17.
0.83 m in length. To make a new pole, they
were attached by overlapping the ends and
tying them together. The length of the
overlap was 12 cm. What was the total
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length of the new pole in metres?
To fi nd out prices of gas in Calgary, go to
1.35 m
and follow the links.
Andrew drove his car 234 km from Dawson
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12 cm
to Mayo in Yukon Territory in 3 h. Brian
0.83 m
drove his truck along the same route at an
average speed of 5 km/h greater than
Determine the mean of each set of numbers.
18.
Andrew’s average speed. How much less
Express your answer to the nearest
time did Brian take, to the nearest minute?
hundredth, if necessary.
0, -4.5, -8.2, 0.4, -7.6, 3.5, -0.2
An aircraft was fl ying at an altitude of
a)
22.
2950 m. It descended for 3 min at 2.5 m/s and
6.3, -2.2, 14.9, -4.8, -5.3, 1.6
b)
then descended for 2.5 min at 2.8 m/s. What
was the plane’s altitude after the descent?
2.2 Problem Solving With Rational Numbers in Decimal Form • MHR
61
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