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Subtract 16/90 from 21/4

1st number: 5 1/4, 2nd number: 16/90

21/4 - 16/90 is 913/180.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 90 is 180
  2. For the 1st fraction, since 4 × 45 = 180,
    21/4 = 21 × 45/4 × 45 = 945/180
  3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
    16/90 = 16 × 2/90 × 2 = 32/180
  4. Subtract the two fractions:
    945/180 - 32/180 = 945 - 32/180 = 913/180
  5. In mixed form: 513/180

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