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Add 15/28 and 12/90

15/28 + 12/90 is 281/420.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 90 is 1260

    Next, find the equivalent fraction of both fractional numbers with denominator 1260
  2. For the 1st fraction, since 28 × 45 = 1260,
    15/28 = 15 × 45/28 × 45 = 675/1260
  3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
    12/90 = 12 × 14/90 × 14 = 168/1260
  4. Add the two like fractions:
    675/1260 + 168/1260 = 675 + 168/1260 = 843/1260
  5. 843/1260 simplified gives 281/420
  6. So, 15/28 + 12/90 = 281/420

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