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Add 21/36 and 42/80

21/36 + 42/80 is 133/120.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 36 and 80 is 720

    Next, find the equivalent fraction of both fractional numbers with denominator 720
  2. For the 1st fraction, since 36 × 20 = 720,
    21/36 = 21 × 20/36 × 20 = 420/720
  3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
    42/80 = 42 × 9/80 × 9 = 378/720
  4. Add the two like fractions:
    420/720 + 378/720 = 420 + 378/720 = 798/720
  5. 798/720 simplified gives 133/120
  6. So, 21/36 + 42/80 = 133/120
    In mixed form: 113/120

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