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Subtract 18/72 from 21/10

1st number: 2 1/10, 2nd number: 18/72

21/10 - 18/72 is 37/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 10 and 72 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 10 × 36 = 360,
    21/10 = 21 × 36/10 × 36 = 756/360
  3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
    18/72 = 18 × 5/72 × 5 = 90/360
  4. Subtract the two like fractions:
    756/360 - 90/360 = 756 - 90/360 = 666/360
  5. After reducing the fraction, the answer is 37/20
  6. In mixed form: 117/20

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