Basic Math & Pre-Algebra All-in-One For Dummies (+ Chapter Quizzes Online). Mark Zegarelli

      7

      (a) Start at , down .

      (b) Start at , up .

      (c) Start at , up .

      (d) Start at , down .

      (e) Start at , down .

      (f) Start at , up .

      8

      (a) 43. Cancel the adjacent negative signs to turn the problem into addition:

      (b) −66. Drop the signs, add the numbers, and negate the result:

      (c) 46. Cancel the adjacent negative signs to turn the problem into addition:

      Now switch around the numbers (with their signs) to turn the problem back into subtraction:

      (d) −158. Drop the signs, add the numbers, and negate the result:

      (e) 124. Cancel the adjacent negative signs to turn the problem into addition:

      (f) −71. Cancel the adjacent negative signs to turn the problem into addition:

      Now switch around the numbers (with their signs) to turn the problem back into subtraction:

      9

      (a)

      (b)

      (c)

      (d)

      10

      (a)

      (b)

      (c)

      (d)

11 First, drop the signs and multiply:

      The numbers have different signs, so the answer is negative: .

      12 Drop the signs and multiply:

      The numbers have the same sign, so the answer is positive: .

      13 Drop the signs and divide (use long division, as I show you in Chapter 2):

      The numbers have different signs, so the answer is negative: .

      14 135. First, drop the signs and divide:

      The numbers

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