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Subtract 7/8 from 21/7

1st number: 3 0/7, 2nd number: 7/8

21/7 - 7/8 is 17/8.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 8 is 56

    Next, find the equivalent fraction of both fractional numbers with denominator 56
  2. For the 1st fraction, since 7 × 8 = 56,
    21/7 = 21 × 8/7 × 8 = 168/56
  3. Likewise, for the 2nd fraction, since 8 × 7 = 56,
    7/8 = 7 × 7/8 × 7 = 49/56
  4. Subtract the two like fractions:
    168/56 - 49/56 = 168 - 49/56 = 119/56
  5. After reducing the fraction, the answer is 17/8
  6. In mixed form: 21/8

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