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Add 20/45 and 72/80

20/45 + 72/80 is 121/90.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 720
  2. For the 1st fraction, since 45 × 16 = 720,
    20/45 = 20 × 16/45 × 16 = 320/720
  3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
    72/80 = 72 × 9/80 × 9 = 648/720
  4. Add the two like fractions:
    320/720 + 648/720 = 320 + 648/720 = 968/720
  5. 968/720 simplified gives 121/90
  6. So, 20/45 + 72/80 = 121/90
    In mixed form: 131/90

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