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Subtract 40/21 from 20/18

1st number: 1 2/18, 2nd number: 1 19/21

20/18 - 40/21 is -50/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 21 is 126

    Next, find the equivalent fraction of both fractional numbers with denominator 126
  2. For the 1st fraction, since 18 × 7 = 126,
    20/18 = 20 × 7/18 × 7 = 140/126
  3. Likewise, for the 2nd fraction, since 21 × 6 = 126,
    40/21 = 40 × 6/21 × 6 = 240/126
  4. Subtract the two like fractions:
    140/126 - 240/126 = 140 - 240/126 = -100/126
  5. After reducing the fraction, the answer is -50/63

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