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Subtract 42/9 from 4/21

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

4/21 - 42/9 is -94/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63
  2. For the 1st fraction, since 21 × 3 = 63,
    4/21 = 4 × 3/21 × 3 = 12/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    42/9 = 42 × 7/9 × 7 = 294/63
  4. Subtract the two fractions:
    12/63 - 294/63 = 12 - 294/63 = -282/63
  5. After reducing the fraction, the answer is -94/21

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