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Subtract 7/8 from 21/20

1st number: 1 1/20, 2nd number: 7/8

21/20 - 7/8 is 7/40.

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,
    21/20 = 21 × 2/20 × 2 = 42/40
  3. Likewise, for the 2nd fraction, since 8 × 5 = 40,
    7/8 = 7 × 5/8 × 5 = 35/40
  4. Subtract the two fractions:
    42/40 - 35/40 = 42 - 35/40 = 7/40

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