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Subtract 21/18 from 7/8

1st number: 7/8, 2nd number: 1 3/18

7/8 - 21/18 is -7/24.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 18 is 72

    Next, find the equivalent fraction of both fractional numbers with denominator 72
  2. For the 1st fraction, since 8 × 9 = 72,
    7/8 = 7 × 9/8 × 9 = 63/72
  3. Likewise, for the 2nd fraction, since 18 × 4 = 72,
    21/18 = 21 × 4/18 × 4 = 84/72
  4. Subtract the two like fractions:
    63/72 - 84/72 = 63 - 84/72 = -21/72
  5. After reducing the fraction, the answer is -7/24

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