20 Chapter 1 The Set of Real Numbers For Exercises 81–84, find the least common multiple for each list of numbers. (See Example 8.) 81. 6, 15 82. 12, 30 83. 20, 8, 4 84. 24, 40, 30 For Exercises 85–100, add or subtract as indicated. (See Examples 9–10.) 85. 86. 87. 88. 89. 90. 91. 92. 93. 94. 95. 96. 97. 98. 99. 100. 9 10 4 5 3 4 4 7 1 2 3 4 1 2 2 3 5 12 1 6 3 4 5 8 3 25 8 35 5 12 5 16 7 6 1 24 5 4 1 20 3 16 9 20 7 18 5 12 25 24 5 16 7 26 2 13 12 35 1 10 11 8 3 10 3 16 1 2 1 8 3 4 101. For his famous brownie recipe, Chef Alfonso 14 2 3 combines cup granulated sugar with cup brown sugar.What is the total amount of sugar in his recipe? 103. Currently, two of the most popular smartphones are the Apple iPhone and the LG Vortex.The thickness of the Vortex is in. while the iPhone measures 9 25 in. How much thicker is the Vortex than the iPhone? 12 Concept 7: Operations on Mixed Numbers For Exercises 105–118, perform the indicated operations. (See Examples 11–12.) 105. 106. 107. 108. 2 9 109. 110. 111. 112. 113. 114. 115. 116. 117. 118. 2 3 7 1 7 8 4 1 2 2 2 3 1 1 6 3 3 4 5 1 3 2 3 4 3 1 2 1 7 8 1 3 14 1 1 14 2 1 8 1 3 8 2 2 5 1 6 2 2 2 5 1 2 7 1 2 9 7 1 3 2 1 2 1 4 5 3 1 5 2 7 8 102. Chef Alfonso eats too many of his brownies and his 38 3 4 waistline increased by in. during one month and in. the next month.What was his total increase for the 2-month period? 3 4 104. The diameter of a penny is in. while the dime is 7 in.How much larger is the penny than the dime? 10
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