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Subtract 70/50 from 42/84

1st number: 42/84, 2nd number: 1 20/50

42/84 - 70/50 is -9/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 50 is 2100

    Next, find the equivalent fraction of both fractional numbers with denominator 2100
  2. For the 1st fraction, since 84 × 25 = 2100,
    42/84 = 42 × 25/84 × 25 = 1050/2100
  3. Likewise, for the 2nd fraction, since 50 × 42 = 2100,
    70/50 = 70 × 42/50 × 42 = 2940/2100
  4. Subtract the two like fractions:
    1050/2100 - 2940/2100 = 1050 - 2940/2100 = -1890/2100
  5. After reducing the fraction, the answer is -9/10

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