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4.1, 4.3: Multiplying and Dividing Rational Numbers

4.1, 4.3: Multiplying and Dividing Rational Numbers. LEQ: How do we multiply and divide fractions?. Multiplying Rational Numbers occurs frequently in daily life: Ex) Interest on a loan equals the principal ( $8500) times the rate ( 5. 5%) times the time ( 2.5 years)

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4.1, 4.3: Multiplying and Dividing Rational Numbers

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  1. 4.1, 4.3: Multiplying and Dividing Rational Numbers LEQ: How do we multiply and divide fractions?

  2. Multiplying Rational Numbers occurs frequently in daily life: • Ex) Interest on a loan equals the principal ( $8500) times the rate ( 5. 5%) times the time ( 2.5 years) • Ex) You need 6 ½ feet of plywood at a cost of $ 3.25 per foot

  3. Multiplying Rational Numbers: • When multiplying fractions by hand you will need to change them to _improper fractions_and then __multiply _.

  4. Ex 1)

  5. Dividing Rational Numbers • When dividing fractions by hand you must __multiply__by the __reciprocal_______.

  6. Ex 6)

  7. A 20-ounce bottle of soda contains teaspoons of sugar . A 12 – ounce can contains 3/5 of that amount. How much sugar is in the 12-ounce can?

  8. You are shopping at Kohl’s for new school clothes. They are having a sale all school clothes are 30% off. You purchase $120 dollars worth of clothes BEFORE the discount. How much money will you actually pay? (Hint: 30%=3/10)

  9. Evaluate each expression if a = - ½ , b = ¾ and c = - 2/3 • 10) 3 a - b • 11) 4 / b • 12)

  10. HWK: p.144-145: 17-34, 45,46

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