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Multiplying and Dividing Integers

Learn how to multiply and divide integers with same and different signs. Practice problems and word problems included.

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Multiplying and Dividing Integers

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  1. Multiplying and Dividing Integers

  2. Rules for Multiplying Integers • Multiply the numbers • Same signs, answer is positive. • Different signs, answer is negative.

  3. Rules for Dividing Integers • Divide the numbers • Same signs, answer is positive. • Different signs, answer is negative.

  4. Examples with Multiplication • 5 × 4 = • 5 × -4 = • -5 × -4 = • -5 × 4 = 20 (Same signs, answer is positive) -20 (Different signs, answer is negative) 20 (Same signs, answer is positive) -20 (Different signs, answer is negative)

  5. Examples with Division • 21 ÷ 3 = • 21 ÷ -3 = • -21 ÷ -3 = • -21 ÷ 3 = 7 (Same signs, answer is positive) -7 (Different signs, answer is negative) 7 (Same signs, answer is positive) -7 (Different signs, answer is negative)

  6. Practice Problems 1. -50 ÷ -5 = 6. 7 × -6 = 2. -9 × 4 = 7. -48 ÷ -8 = 3. 60 ÷ -12 = 8. -11 × 6 = 4. -8 × -7 = 9. 72 ÷ -9 = 5. -100 ÷ 10 = 10. -15 × -2 = 10 -42 -36 6 -5 -66 56 -8 -10 30

  7. Word Problems • The temperature is currently at 10°Fahrenheit. The temperature decreases 7 degrees every hour. If 2 hours pass, what is the new temperature? • 7 × 2 = 14 so it decreases 14⁰F 10 – 14 = -4⁰F • Jane has $125 in her bank account. Her cell phone bill is $47 a month. If she pays that bill two months in a row and doesn’t buy anything else or deposit any money, how much money does she have left? • 47 × 2 = $94 to pay the bills $125 - $94 = $31 left

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