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Subtract 21/27 from 42/30

1st number: 1 12/30, 2nd number: 21/27

42/30 - 21/27 is 28/45.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 27 is 270
  2. For the 1st fraction, since 30 × 9 = 270,
    42/30 = 42 × 9/30 × 9 = 378/270
  3. Likewise, for the 2nd fraction, since 27 × 10 = 270,
    21/27 = 21 × 10/27 × 10 = 210/270
  4. Subtract the two fractions:
    378/270 - 210/270 = 378 - 210/270 = 168/270
  5. After reducing the fraction, the answer is 28/45

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