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Subtract 21/10 from 20/36

1st number: 20/36, 2nd number: 2 1/10

20/36 - 21/10 is -139/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 36 and 10 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 36 × 5 = 180,
    20/36 = 20 × 5/36 × 5 = 100/180
  3. Likewise, for the 2nd fraction, since 10 × 18 = 180,
    21/10 = 21 × 18/10 × 18 = 378/180
  4. Subtract the two like fractions:
    100/180 - 378/180 = 100 - 378/180 = -278/180
  5. After reducing the fraction, the answer is -139/90

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