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Subtract 42/90 from 21/16

1st number: 1 5/16, 2nd number: 42/90

21/16 - 42/90 is 203/240.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 16 and 90 is 720

    Next, find the equivalent fraction of both fractional numbers with denominator 720
  2. For the 1st fraction, since 16 × 45 = 720,
    21/16 = 21 × 45/16 × 45 = 945/720
  3. Likewise, for the 2nd fraction, since 90 × 8 = 720,
    42/90 = 42 × 8/90 × 8 = 336/720
  4. Subtract the two like fractions:
    945/720 - 336/720 = 945 - 336/720 = 609/720
  5. After reducing the fraction, the answer is 203/240

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