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Subtract 7/8 from 21/15

1st number: 1 6/15, 2nd number: 7/8

21/15 - 7/8 is 21/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 8 is 120
  2. For the 1st fraction, since 15 × 8 = 120,
    21/15 = 21 × 8/15 × 8 = 168/120
  3. Likewise, for the 2nd fraction, since 8 × 15 = 120,
    7/8 = 7 × 15/8 × 15 = 105/120
  4. Subtract the two fractions:
    168/120 - 105/120 = 168 - 105/120 = 63/120
  5. After reducing the fraction, the answer is 21/40

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