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Add 21/42 and 60/80

21/42 + 60/80 is 5/4.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 80 is 1680

    Next, find the equivalent fraction of both fractional numbers with denominator 1680
  2. For the 1st fraction, since 42 × 40 = 1680,
    21/42 = 21 × 40/42 × 40 = 840/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    60/80 = 60 × 21/80 × 21 = 1260/1680
  4. Add the two like fractions:
    840/1680 + 1260/1680 = 840 + 1260/1680 = 2100/1680
  5. 2100/1680 simplified gives 5/4
  6. So, 21/42 + 60/80 = 5/4
    In mixed form: 11/4

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