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Subtract 18/20 from 12/7

1st number: 1 5/7, 2nd number: 18/20

12/7 - 18/20 is 57/70.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 20 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 7 × 20 = 140,
    12/7 = 12 × 20/7 × 20 = 240/140
  3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
    18/20 = 18 × 7/20 × 7 = 126/140
  4. Subtract the two like fractions:
    240/140 - 126/140 = 240 - 126/140 = 114/140
  5. After reducing the fraction, the answer is 57/70

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