Page 282 - Basic College Mathematics with Early Integers

S E C T I O N 3.7 I OPERATIONS ON MIXED NUMBERS 259

Review

Evaluate each expression. See Section 1.9.

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105. 20 , 10 2 106. 36 - 5 6 + 10 107. 2 + 318 7 - 12 108. 2110 - 2 52 + 13

Concept Extensions

Solve. See the first Concept Check in this section.
3
109. Which of the following are equivalent to 10? 110. Which of the following are equivalent to 7 ?
4
5 100 44 13 7 11 12
a. 9 b. 9 c. 6 d. 8 a. 6 b. 5 c. 7 d. all of them
5 100 11 13 4 4 16

Solve. See the second Concept Check in this section.
111. A student asked you to check her work below. Is it 112. A student asked you to check his work below. Is it
correct? If not, where is the error? correct? If not, where is the error?
2 1 1 2 1 2
20 , 10 2 3 # 1 3
3 2 3 3 7 21

113. In your own words, describe how to divide 114. In your own words, explain how to multiply
mixed numbers. a. fractions
b. mixed numbers

Solve. See the third Concept Check in this section.

115. In your own words, explain how to round a mixed 116. Use rounding to estimate the best sum for
number to the nearest whole number. 19 1
11 + 9 .
20 10
a. 2 b. 3 c. 20 d. 21

Solve.
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117. Explain in your own words why 9 is equal 118. In your own words, explain
9
4 a. when to borrow when subtracting mixed
to 10 .
9 numbers, and
b. how to borrow when subtracting mixed
numbers.