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Fraction XII
Subtracting Unlike Denominators
  • By Monica Yuskaitis
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Common Multiple
  •   A number that is a multiple of two or more numbers.
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Least Common Multiple
  •   The smallest common multiple of a set of two or more numbers.
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Shortcut for Finding the Least Common Denominator or Least Common Multiple
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To Subtract Fractions With Unlike Denominators
  •   Find the multiples of each denominator.
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To Subtract Fractions With Unlike Denominators
  •   Compare the lists of multiples.  Circle the common multiples between the two lists.
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To Subtract Fractions With Unlike Denominators
  •   Use the lowest common multiple as the denominator.
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To Subtract Fractions With Unlike Denominators
  •   This number is also called the least common denominator.
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To Subtract Fractions With Unlike Denominators
  •   Rewrite the fractions using the least common denominator or least common multiple.
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To Subtract Fractions With Unlike Denominators
  •   Find the equivalent fractions for 1/5 & 1/10 with 10 as the denominator.
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To Subtract Fractions With Unlike Denominators
  •   Find the equivalent fractions for 1/5 & 1/10 with 10 as the denominator.
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To Subtract Fractions With Unlike Denominators
  •   Find the equivalent fractions for 1/5 & 1/10 with 10 as the denominator.
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To Subtract Fractions With Unlike Denominators
  •   Find the equivalent fractions for 1/5 & 1/10 with 10 as the denominator.
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To Subtract Fractions With Unlike Denominators
  •   Now just add the numerators.
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Subtract these Fractions
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Subtract these Fractions
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Subtract these Fractions
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Subtract these Fractions
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Subtract these Fractions
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Subtract these Fractions
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Subtract these Fractions
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Subtract these Fractions
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Subtract these Fractions
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Subtract these Fractions
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Subtract these Fractions
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Subtract these Fractions
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Subtract these Fractions