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Subtract 72/10 from 70/42

1st number: 1 28/42, 2nd number: 7 2/10

70/42 - 72/10 is -83/15.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 10 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 42 × 5 = 210,
    70/42 = 70 × 5/42 × 5 = 350/210
  3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
    72/10 = 72 × 21/10 × 21 = 1512/210
  4. Subtract the two like fractions:
    350/210 - 1512/210 = 350 - 1512/210 = -1162/210
  5. After reducing the fraction, the answer is -83/15

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