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Subtract 18/70 from 81/80

1st number: 1 1/80, 2nd number: 18/70

81/80 - 18/70 is 423/560.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 70 is 560
  2. For the 1st fraction, since 80 × 7 = 560,
    81/80 = 81 × 7/80 × 7 = 567/560
  3. Likewise, for the 2nd fraction, since 70 × 8 = 560,
    18/70 = 18 × 8/70 × 8 = 144/560
  4. Subtract the two fractions:
    567/560 - 144/560 = 567 - 144/560 = 423/560

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