Proper Fraction x Proper Fraction 5-56
Multiply proper fractions by breaking one or both proper fractions into unit fractions. What's 4/5 x 2/3? Since 2/3 = 1/3 + 1/3, multiply 4/5 x (1/3 + 1/3) = 4/15 + 4/15 = 8/15. Algorithm? Multiply numerators to get the number of new parts. Multiply denominators to get the size of each part. What's 2/3 x 2/3? (2x2)/(3x3) = 4/9.
