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Subtract 63/40 from 21/30

1st number: 21/30, 2nd number: 1 23/40

21/30 - 63/40 is -7/8.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 40 is 120

    Next, find the equivalent fraction of both fractional numbers with denominator 120
  2. For the 1st fraction, since 30 × 4 = 120,
    21/30 = 21 × 4/30 × 4 = 84/120
  3. Likewise, for the 2nd fraction, since 40 × 3 = 120,
    63/40 = 63 × 3/40 × 3 = 189/120
  4. Subtract the two like fractions:
    84/120 - 189/120 = 84 - 189/120 = -105/120
  5. After reducing the fraction, the answer is -7/8

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