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Subtract 21/9 from 20/7

1st number: 2 6/7, 2nd number: 2 3/9

20/7 - 21/9 is 11/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 9 is 63

    Next, find the equivalent fraction of both fractional numbers with denominator 63
  2. For the 1st fraction, since 7 × 9 = 63,
    20/7 = 20 × 9/7 × 9 = 180/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    21/9 = 21 × 7/9 × 7 = 147/63
  4. Subtract the two like fractions:
    180/63 - 147/63 = 180 - 147/63 = 33/63
  5. After reducing the fraction, the answer is 11/21

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