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How Do You Multiply and Divide Numbers with Different Signs?

Compute the following quantities:
A) 3•5 B) (-3)•5 C) (-3)•(-5) D) [(-4)•(-5)]/(-2)

Summary

  1. It might be easier to just ignore the signs by working with the absolute values of these numbers
  2. 3 • 5 = 15
  3. 4 • 5 = 20
  4. 20 / 2 = 10
  5. Determine whether the answers are positive or negative
  6. a) is positive, so just write 15
  7. b) is negative, so write -15
  8. c) is positive, so just write 15
  9. d) is negative, so write -10

Notes

    1. It might be easier to just ignore the signs by working with the absolute values of these numbers
    1. It might be easier to just ignore the signs by working with the absolute values of these numbers
    2. 3 • 5 = 15
    1. It might be easier to just ignore the signs by working with the absolute values of these numbers
    2. 3 • 5 = 15
    1. It might be easier to just ignore the signs by working with the absolute values of these numbers
    2. 3 • 5 = 15
    1. It might be easier to just ignore the signs by working with the absolute values of these numbers
    2. 4 • 5 = 20
    3. 20 / 2 = 10
    1. Go back and look at the original products and quotients
    2. Which have positive answers, and which have negative answers?
    1. Go back and look at the original products and quotients
    2. Which have positive answers, and which have negative answers?
    3. + times + equals +
    1. Go back and look at the original products and quotients
    2. Which have positive answers, and which have negative answers?
    3. - times + equals -
    1. Go back and look at the original products and quotients
    2. Which have positive answers, and which have negative answers?
    3. - times - equals +
    1. Go back and look at the original products and quotients
    2. Which have positive answers, and which have negative answers?
    3. - times - equals +
    4. + divided by - equals -
    1. Put together each number with their proper sign
    1. Put together each number with their proper sign
    1. Put together each number with their proper sign
    1. Put together each number with their proper sign
    1. Put together each number with their proper sign