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Subtract 90/70 from 4/72

1st number: 4/72, 2nd number: 1 20/70

4/72 - 90/70 is -155/126.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 70 is 2520

    Next, find the equivalent fraction of both fractional numbers with denominator 2520
  2. For the 1st fraction, since 72 × 35 = 2520,
    4/72 = 4 × 35/72 × 35 = 140/2520
  3. Likewise, for the 2nd fraction, since 70 × 36 = 2520,
    90/70 = 90 × 36/70 × 36 = 3240/2520
  4. Subtract the two like fractions:
    140/2520 - 3240/2520 = 140 - 3240/2520 = -3100/2520
  5. After reducing the fraction, the answer is -155/126

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