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Subtract 3/20 from 90/70

1st number: 1 20/70, 2nd number: 3/20

90/70 - 3/20 is 159/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 20 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 70 × 2 = 140,
    90/70 = 90 × 2/70 × 2 = 180/140
  3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
    3/20 = 3 × 7/20 × 7 = 21/140
  4. Subtract the two like fractions:
    180/140 - 21/140 = 180 - 21/140 = 159/140
  5. In mixed form: 119/140

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