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Subtract 28/20 from 75/70

1st number: 1 5/70, 2nd number: 1 8/20

75/70 - 28/20 is -23/70.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 20 is 140
  2. For the 1st fraction, since 70 × 2 = 140,
    75/70 = 75 × 2/70 × 2 = 150/140
  3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
    28/20 = 28 × 7/20 × 7 = 196/140
  4. Subtract the two fractions:
    150/140 - 196/140 = 150 - 196/140 = -46/140
  5. After reducing the fraction, the answer is -23/70

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