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Subtract 9/7 from 21/15

1st number: 1 6/15, 2nd number: 1 2/7

21/15 - 9/7 is 4/35.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 7 is 105
  2. For the 1st fraction, since 15 × 7 = 105,
    21/15 = 21 × 7/15 × 7 = 147/105
  3. Likewise, for the 2nd fraction, since 7 × 15 = 105,
    9/7 = 9 × 15/7 × 15 = 135/105
  4. Subtract the two fractions:
    147/105 - 135/105 = 147 - 135/105 = 12/105
  5. After reducing the fraction, the answer is 4/35

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