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Add 36/42 and 21/80

36/42 + 21/80 is 627/560.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 80 is 1680
  2. For the 1st fraction, since 42 × 40 = 1680,
    36/42 = 36 × 40/42 × 40 = 1440/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    21/80 = 21 × 21/80 × 21 = 441/1680
  4. Add the two fractions:
    1440/1680 + 441/1680 = 1440 + 441/1680 = 1881/1680
  5. 1881/1680 simplified gives 627/560
  6. So, 36/42 + 21/80 = 627/560
    In mixed form: 167/560

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