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Subtract 20/18 from 81/70

1st number: 1 11/70, 2nd number: 1 2/18

81/70 - 20/18 is 29/630.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 18 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 70 × 9 = 630,
    81/70 = 81 × 9/70 × 9 = 729/630
  3. Likewise, for the 2nd fraction, since 18 × 35 = 630,
    20/18 = 20 × 35/18 × 35 = 700/630
  4. Subtract the two like fractions:
    729/630 - 700/630 = 729 - 700/630 = 29/630

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