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Subtract 72/20 from 20/70

1st number: 20/70, 2nd number: 3 12/20

20/70 - 72/20 is -116/35.

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,
    20/70 = 20 × 2/70 × 2 = 40/140
  3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
    72/20 = 72 × 7/20 × 7 = 504/140
  4. Subtract the two fractions:
    40/140 - 504/140 = 40 - 504/140 = -464/140
  5. After reducing the fraction, the answer is -116/35

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