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Subtract 42/9 from 10/21

1st number: 10/21, 2nd number: 4 6/9

10/21 - 42/9 is -88/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63

    Next, find the equivalent fraction of both fractional numbers with denominator 63
  2. For the 1st fraction, since 21 × 3 = 63,
    10/21 = 10 × 3/21 × 3 = 30/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    42/9 = 42 × 7/9 × 7 = 294/63
  4. Subtract the two like fractions:
    30/63 - 294/63 = 30 - 294/63 = -264/63
  5. After reducing the fraction, the answer is -88/21

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