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Add/Subtract fractions same denominator
Objective: students will be able to add and subtract fractions with like denominators.
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Information Like fractions: same denominator.
Add: add numerators, keep denominators. Reduce if needed Ex: 1/5 + 2/5 = 3/5 Subtraction: change to addition, use addition rules
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Ex: add/subtract fractions
1/8 + 2/8 10/19 + 8/19 4/15 – 7/15 1/12 – (-8/12)
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ST: add/subtract fractions
4/9 + 1/9 -5/7 + 5/7 -15/27 – 13/27 10/15 – 8/15
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Information: Add/subtract Mixed numbers
Steps Change to improper Add/subtract Leave or change to mixed fraction (reduce)
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Ex: mixed/improper fraction
3 ¾ + 1 ¾ 7 1/5 – 2 3/5
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St: improper/mixed fraction
2 4/ /5 2 1/4 – 5 3/4
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Information: variables and fractions
2a/20 + 5a/20 4x/8 + x/8
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ST: variables and fractions
-10/6p + 17/6p 8m/21 – 5m/21
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Wrap-up Questions/Comments Hw: workbook pg. 35
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