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Subtract 1/8 from 42/21

1st number: 2 0/21, 2nd number: 1/8

42/21 - 1/8 is 15/8.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 8 is 168

    Next, find the equivalent fraction of both fractional numbers with denominator 168
  2. For the 1st fraction, since 21 × 8 = 168,
    42/21 = 42 × 8/21 × 8 = 336/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    1/8 = 1 × 21/8 × 21 = 21/168
  4. Subtract the two like fractions:
    336/168 - 21/168 = 336 - 21/168 = 315/168
  5. After reducing the fraction, the answer is 15/8
  6. In mixed form: 17/8

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