Lesson 2-3 Multiplying Rational NumbersWrite in simplest form:1. Find 9873.2. Find 12743.3. Find 431513.4. Evaluate prq if p = 32, r = 54, and q = 87.5. Low-flow showerheads use 212gallonsof water per minute. If family members shower a total of 312hours per week, about how much water does the family use for showers each week?Multiplying Fractions – Multiply numerator times numerator and denominator times denominator.1585432bdacdcbawhere b 0, d 0.Cross-Cancel – Divide a numerator and denominator by the same number.165836512Multiplying Mixed Numbers:1.Backwards C (multiply, then add).2.Cross cancel.3. Multiply.1211238293222141413Lesson 2-4 Dividing Rational NumbersGlencoe Math App & Con (2006) – Course 3
Find the multiplicative inverse:1. 3122. 853. 7 4. 74Write in simplest form:5. 521032...9. One summer day, a cinema shows a hit action movie repeatedly for 2112hours. It takes about 150 minutes to run the movie and prepare for the next showing. How many times does the cinema show the movie that day?Inverse Property of Multiplication – Any number times it’s reciprocal (multiplicative inverse) equals 1.123321abbaDivide Fractions – Multiply by the multiplicative inverse.Why does this work?Lesson 2-5 Adding and Subtracting Like FractionsWrite in simplest form:1. 9795.Add Like Fractions – Add the numerators and write the sum over the denominator.