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Subtract 15/45 from 21/35

21/35 - 15/45 is 4/15.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 35 and 45 is 315

    Next, find the equivalent fraction of both fractional numbers with denominator 315
  2. For the 1st fraction, since 35 × 9 = 315,
    21/35 = 21 × 9/35 × 9 = 189/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    15/45 = 15 × 7/45 × 7 = 105/315
  4. Subtract the two like fractions:
    189/315 - 105/315 = 189 - 105/315 = 84/315
  5. After reducing the fraction, the answer is 4/15

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