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Subtract 30/70 from 28/72

28/72 - 30/70 is -5/126.

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,
    28/72 = 28 × 35/72 × 35 = 980/2520
  3. Likewise, for the 2nd fraction, since 70 × 36 = 2520,
    30/70 = 30 × 36/70 × 36 = 1080/2520
  4. Subtract the two like fractions:
    980/2520 - 1080/2520 = 980 - 1080/2520 = -100/2520
  5. After reducing the fraction, the answer is -5/126

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