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Add 15/80 and 21/45

15/80 + 21/45 is 157/240.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 45 is 720

    Next, find the equivalent fraction of both fractional numbers with denominator 720
  2. For the 1st fraction, since 80 × 9 = 720,
    15/80 = 15 × 9/80 × 9 = 135/720
  3. Likewise, for the 2nd fraction, since 45 × 16 = 720,
    21/45 = 21 × 16/45 × 16 = 336/720
  4. Add the two like fractions:
    135/720 + 336/720 = 135 + 336/720 = 471/720
  5. 471/720 simplified gives 157/240
  6. So, 15/80 + 21/45 = 157/240

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