Objective: Use visual models to add and subtract two fractions with the same units.
In Lessons 16 and 17, students generalize familiar facts about whole number addition and subtraction to work with fractions. Just as 3 apples – 2 apples = 1 apple, students note that 3 fourths – 2 fourths = 1 fourth. Just as 6 days + 3 days = 9 days = 1 week 2 days, students note that 6/7 + 3/7 = 9/7 = 7/7 + 2/7 = 1 2/7.
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