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Subtract 16/90 from 21/28

21/28 - 16/90 is 103/180.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 90 is 1260

    Next, find the equivalent fraction of both fractional numbers with denominator 1260
  2. For the 1st fraction, since 28 × 45 = 1260,
    21/28 = 21 × 45/28 × 45 = 945/1260
  3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
    16/90 = 16 × 14/90 × 14 = 224/1260
  4. Subtract the two like fractions:
    945/1260 - 224/1260 = 945 - 224/1260 = 721/1260
  5. After reducing the fraction, the answer is 103/180

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