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Add 54/80 and 21/45

54/80 + 21/45 is 137/120.

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,
    54/80 = 54 × 9/80 × 9 = 486/720
  3. Likewise, for the 2nd fraction, since 45 × 16 = 720,
    21/45 = 21 × 16/45 × 16 = 336/720
  4. Add the two like fractions:
    486/720 + 336/720 = 486 + 336/720 = 822/720
  5. 822/720 simplified gives 137/120
  6. So, 54/80 + 21/45 = 137/120
    In mixed form: 117/120

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