Page 255 - Basic College Mathematics with Early Integers

232 C HAPTE R 3 I FRACTIONS

Review

Use order of operations to simplify. See Section 1.9.

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91. 50 , 5 2 92. 8 - 6 4 - 7 93. (8 - 6) (4 - 7) 94. 50 , (5 2)
Concept Extensions

For Exercises 95 and 96 below, do the following:

a. Draw three rectangles of the same size and represent each fraction in the sum or difference, one fraction per rectangle,
by shading.
b. Using these rectangles as estimates, determine whether there is an error in the sum or difference.
c. If there is an error, correctly calculate the sum or difference.
See the Concept Checks in this section.

3 4 7 5 3 2
95. + 96. -
5 5 10 8 4 4

Subtract from left to right.

2 1 2 9 7 1
97. - - 98. - -
3 4 540 10 200 3

Perform each indicated operation.

30 1000 19 968
99. + 100. -
55 1760 26 1352

101. In your own words, describe how to add or 102. Find the sum of the fractions in the circle graph on
subtract two fractions with different page 231. Did the sum surprise you? Why or why
denominators. not?

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103. In a recent year, about of the total number of pieces of mail delivered by the United States Postal Service
53
51
was first-class mail.That same year, about of the total number of pieces of mail delivered by the United
106
States Postal Service was standard mail.Which of these two categories account for a greater portion of the mail
handled by volume? (Source: United States Postal Service)

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