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Name• Adding and Subtracting Mixed Numbers with DifferentDenominators<strong>Reteach</strong>ingLesson <strong>12</strong>0<strong>12</strong>0• To add or subtract mixed numbers with different denominators:1. Copy the problem vertically.2. Rename the fractions so that they have common denominators.3. Add or subtract the fraction side.4. Add or subtract the whole numbers.5. Reduce the fraction side.Example:Practice:3 __ 1 7 = 3 ___ 214+ 2 ___ 614 = 2 ___ 6145 ___ 814 = 5 __ 4 7Find each sum or difference. Reduce when possible.1. 2 __ 1 3 + 1 ___ <strong>12</strong>152 1 __3 = 2 ___+ 1 ___ <strong>12</strong>15 = 1 ___ <strong>12</strong>152. 5 __ 3 7 + 2 ___ 5145 3 __7 = ________+ 000000 = ____3. 4 __ 2 3 + 3 __ 6 94 2 __3 = ____4. 6 __ 1 8 + 3 __ 3 46 1 __8 = ________+ 000000 = ________+ 000000 = ____5. 3 __ 5 8 – 2 __ 1 43 __ 5 8 = 3 __ 5 86. 2 ___ 610 – 2 __ 2 52 ___ 610 = ____– 2 __ 1 4 = 2 ___ 0000____– 000000 = ____7. 9 ___ 11<strong>12</strong> – 7 __ 5 69 ___ 11<strong>12</strong> = ____8. 5 ___ 914 – 4 __ 3 75 ___ 914 = ________– 000000 = ____– 000 ____000 = ____Saxon Math Intermediate 4 © Harcourt Achieve Inc. and Stephen Hake. All rights reserved. 131
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