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Subtract 21/27 from 42/20

1st number: 2 2/20, 2nd number: 21/27

42/20 - 21/27 is 119/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 27 is 540
  2. For the 1st fraction, since 20 × 27 = 540,
    42/20 = 42 × 27/20 × 27 = 1134/540
  3. Likewise, for the 2nd fraction, since 27 × 20 = 540,
    21/27 = 21 × 20/27 × 20 = 420/540
  4. Subtract the two fractions:
    1134/540 - 420/540 = 1134 - 420/540 = 714/540
  5. After reducing the fraction, the answer is 119/90
  6. In mixed form: 129/90

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