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Subtract 1/42 from 21/15

1st number: 1 6/15, 2nd number: 1/42

21/15 - 1/42 is 289/210.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 42 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 15 × 14 = 210,
    21/15 = 21 × 14/15 × 14 = 294/210
  3. Likewise, for the 2nd fraction, since 42 × 5 = 210,
    1/42 = 1 × 5/42 × 5 = 5/210
  4. Subtract the two like fractions:
    294/210 - 5/210 = 294 - 5/210 = 289/210
  5. In mixed form: 179/210

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