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Subtract 1/21 from 42/18

1st number: 2 6/18, 2nd number: 1/21

42/18 - 1/21 is 16/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 21 is 126

    Next, find the equivalent fraction of both fractional numbers with denominator 126
  2. For the 1st fraction, since 18 × 7 = 126,
    42/18 = 42 × 7/18 × 7 = 294/126
  3. Likewise, for the 2nd fraction, since 21 × 6 = 126,
    1/21 = 1 × 6/21 × 6 = 6/126
  4. Subtract the two like fractions:
    294/126 - 6/126 = 294 - 6/126 = 288/126
  5. After reducing the fraction, the answer is 16/7
  6. In mixed form: 22/7

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