FRACTIONS Review of Introductory MathematicsExample 1:Add and115710Solution:Step 1: Find primes of each denominator.15 = 5 x 310 = 5 x 2Step 2: In the example, 15 is the largest denominator, so use the 5 and the 3; nowlook at the second denominator’s primes—the five already appears in thelist, but the 2 does not, so use the 2.5 x 3 x 2 = 30Step 3: Rewrite with least common denominators.1152307102130Step 4: Add the new fractions.23021302330Example 2:Add1723111246Solution:Step 1: Find primes of each denominator.7 = 7 (already is a prime number)3 = 3 (already is a prime number)12 = 2 x 6 = 2 x 2 x 36 = 2 x 3Step 2: 12 is the largest, so start with2 x 2 x 3MA-01 Page 32 Rev. 0

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