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Subtract 21/8 from 35/20

1st number: 1 15/20, 2nd number: 2 5/8

35/20 - 21/8 is -7/8.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 8 is 40
  2. For the 1st fraction, since 20 × 2 = 40,
    35/20 = 35 × 2/20 × 2 = 70/40
  3. Likewise, for the 2nd fraction, since 8 × 5 = 40,
    21/8 = 21 × 5/8 × 5 = 105/40
  4. Subtract the two fractions:
    70/40 - 105/40 = 70 - 105/40 = -35/40
  5. After reducing the fraction, the answer is -7/8

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