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Add 12/80 and 4/21

12/80 + 4/21 is 143/420.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 21 is 1680

    Next, find the equivalent fraction of both fractional numbers with denominator 1680
  2. For the 1st fraction, since 80 × 21 = 1680,
    12/80 = 12 × 21/80 × 21 = 252/1680
  3. Likewise, for the 2nd fraction, since 21 × 80 = 1680,
    4/21 = 4 × 80/21 × 80 = 320/1680
  4. Add the two like fractions:
    252/1680 + 320/1680 = 252 + 320/1680 = 572/1680
  5. 572/1680 simplified gives 143/420
  6. So, 12/80 + 4/21 = 143/420

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