The strategy work backward can help us solve a problem with fractions that involve addition and subtraction. We can write an equation to help us represent the problem, then we can work backward to solve for the unknown using an inverse operation. Remember, before we can add or subtract fractions, the fractions must have a common denominator. We can multiply their denominators and use the product as a common denominator. We can use the least common multiple of the denominators. Remember, we can rename mixed numbers as fractions greater than 1 to subtract. We solve four word problems using fraction addition and subtraction with renaming.
5th Grade Math 6.1, Model Addition with Unlike Denominators
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5th Grade Math 6.2, Model Subtraction with Unlike Denominators
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5th Grade Math 6.3, Estimate Fraction Sums & Differences
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5th Grade Math 6.4, Common Denominators & Equivalent Fractions
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5th Grade Math 6.5, Add & Subtract Fractions with Unlike Denominators
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5th Grade Math 6.6, Add & Subtract Mixed Numbers with Unlike Denominators
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5th Grade Math 6.7, Subtract Mixed Numbers with Renaming
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5th Grade Math 6.8, Patterns with Fractions (Sequences with + & -)
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5th Grade Math Playlist
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I'm using the Houghton Mifflin Go Math!
2015 copyright textbook for this playlist.
You can practice online using the textbook's website
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