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Subtract 20/42 from 15/8

1st number: 1 7/8, 2nd number: 20/42

15/8 - 20/42 is 235/168.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 42 is 168

    Next, find the equivalent fraction of both fractional numbers with denominator 168
  2. For the 1st fraction, since 8 × 21 = 168,
    15/8 = 15 × 21/8 × 21 = 315/168
  3. Likewise, for the 2nd fraction, since 42 × 4 = 168,
    20/42 = 20 × 4/42 × 4 = 80/168
  4. Subtract the two like fractions:
    315/168 - 80/168 = 315 - 80/168 = 235/168
  5. In mixed form: 167/168

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