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Add 21/12 and 15/25

1st number: 1 9/12, 2nd number: 15/25

21/12 + 15/25 is 47/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 25 is 300

    Next, find the equivalent fraction of both fractional numbers with denominator 300
  2. For the 1st fraction, since 12 × 25 = 300,
    21/12 = 21 × 25/12 × 25 = 525/300
  3. Likewise, for the 2nd fraction, since 25 × 12 = 300,
    15/25 = 15 × 12/25 × 12 = 180/300
  4. Add the two like fractions:
    525/300 + 180/300 = 525 + 180/300 = 705/300
  5. 705/300 simplified gives 47/20
  6. So, 21/12 + 15/25 = 47/20
    In mixed form: 27/20

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