Decimal Form Of Rational Numbers Worksheet - Chapter 2.2, Mathlink 9, Mcgraw-Hill Ryerson School Page 6

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Practise
In Regina, Saskatchewan, the average
For help with #4 and #5, refer to Example 1 on page 56.
10.
mid-afternoon temperature in January is
Estimate and calculate.
4.
-12.6 °C. The average mid-afternoon
0.98 + (-2.91)
a)
temperature in July is 26.1 °C. How many
5.46 - 3.16
b)
degrees colder is Regina in January than
-4.23 + (-5.75)
c)
in July?
-1.49 - (-6.83)
d)
One January day in Penticton, British
11.
Columbia, the temperature read -6.3 °C
Calculate.
5.
at 10:00 a.m. and 1.4 °C at 3:00 p.m.
9.37 - 11.62
-0.512 + 2.385
a)
b)
What was the change in temperature?
a)
0.675 - (-0.061)
-10.95 + (-1.99)
c)
d)
What was the average rate of change in
b)
temperature?
For help with #6 and #7, refer to Example 2 on page 57.
Estimate and calculate.
6.
Apply
2.7 × (-3.2)
a)
A pelican dives vertically from a height of
12.
-3.25 ÷ 2.5
b)
3.8 m above the water. It then catches a fi sh
-5.5 × (-5.5)
c)
2.3 m underwater.
-4.37 ÷ (-0.95)
d)
Write an expression using rational
a)
numbers to represent the length of the
Calculate. Express your answer to the
7.
pelican’s dive.
nearest thousandth, if necessary.
How long is the pelican’s dive?
b)
8.6 ÷ 0.9
-2.4(-1.5)
a)
b)
19.5 ÷ (-16.2)
-5.3(4.2)
c)
d)
A submarine was cruising at a depth of
13.
1.12(0.68)
-0.55 ÷ 0.66
e)
f)
153 m. It then rose at 4.5 m/min for 15 min.
What was the submarine’s depth at the
a)
For help with #8 to #11, refer to Example 3 on page 58.
end of this rise?
Evaluate.
8.
If the submarine continues to rise at the
b)
-2.1 × 3.2 + 4.3 × (-1.5)
same rate, how much longer will it take
a)
to reach the surface?
-3.5(4.8 - 5.6)
b)
-1.1[2.3 - (-0.5)]
c)
Saida owned 125 shares of an oil company.
14.
One day, the value of each share dropped by
$0.31. The next day, the value of each share
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rose by $0.18. What was the total change in
In -1.1[2.3 - (-0.5)], square brackets are used for
the value of Saida’s shares?
grouping because -0.5 is already in parentheses.
Determine each value.
9.
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(4.51 - 5.32)(5.17 - 6.57)
a)
A share is one unit of ownership in a corporation.
2.4 + 1.8 × 5.7 ÷ (-2.7)
b)
-4.36 + 1.2[2.8 + (-3.5)]
c)
60
MHR • Chapter 2

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