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Subtract 21/9 from 2/8

1st number: 2/8, 2nd number: 2 3/9

2/8 - 21/9 is -25/12.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 9 is 72

    Next, find the equivalent fraction of both fractional numbers with denominator 72
  2. For the 1st fraction, since 8 × 9 = 72,
    2/8 = 2 × 9/8 × 9 = 18/72
  3. Likewise, for the 2nd fraction, since 9 × 8 = 72,
    21/9 = 21 × 8/9 × 8 = 168/72
  4. Subtract the two like fractions:
    18/72 - 168/72 = 18 - 168/72 = -150/72
  5. After reducing the fraction, the answer is -25/12

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