Page 115

miller_prealgebra_2e_ch1_3

Section 2.4 Multiplication and Division of Integers 113 95. 96. 24 0 97. 90 0 98. 99. 122 152 142 100. 1102 122 132 152 101. 172 2 102. 72 103. a. What number must be multiplied by 5 to obtain 35? b. What number must be multiplied by 5 to obtain 35? 104. a. What number must be multiplied by 4 to obtain 36? b. What number must be multiplied by 4 to obtain 36? Expanding Your Skills The electrical charge of an atom is determined by the number of protons and number of electrons an atom has. Each proton gives a positive charge 112 and each electron gives a negative charge 112. An atom that has a total charge of 0 is said to be electrically neutral. An atom that is not electrically neutral is called an ion. For Exercises 105–108, determine the total charge for an atom with the given number of protons and electrons. 105. 1 proton, 0 electrons 106. 17 protons, 18 electrons 107. 8 protons, 10 electrons 108. 20 protons, 18 electrons For Exercises 109–114, assume a 0 (this means that a is positive) and b 0 (this means that b is negative). Find the sign of each expression. 109. a b 110. b a 111. b 0a 0 112. a 0b 0 113. a b 114. a1b2 0 5 0 2 Electron () Proton () The Hydrogen Atom Calculator Connections Topic: Multiplying and Dividing Integers on a Calculator Knowing the sign of the product or quotient can make using the calculator easier. For example, look at Note the keystrokes if we enter this into the calculator as written: 78 26. Expression Keystrokes Result 78 26 or 78 26 78 26 But since we know that the quotient of two negative numbers is positive, we can simply enter: 78 26 Calculator Exercises For Exercises 115–118, use a calculator to perform the indicated operations. 115. 14132 18712 116. 6125 1972 576,828 10,682 117. 118. 5,945,308 194522 3 3 3


miller_prealgebra_2e_ch1_3
To see the actual publication please follow the link above