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Subtract 5/7 from 21/80

21/80 - 5/7 is -253/560.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 7 is 560

    Next, find the equivalent fraction of both fractional numbers with denominator 560
  2. For the 1st fraction, since 80 × 7 = 560,
    21/80 = 21 × 7/80 × 7 = 147/560
  3. Likewise, for the 2nd fraction, since 7 × 80 = 560,
    5/7 = 5 × 80/7 × 80 = 400/560
  4. Subtract the two like fractions:
    147/560 - 400/560 = 147 - 400/560 = -253/560

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