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Add 1/21 and 42/80

1/21 + 42/80 is 481/840.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 1680
  2. For the 1st fraction, since 21 × 80 = 1680,
    1/21 = 1 × 80/21 × 80 = 80/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    42/80 = 42 × 21/80 × 21 = 882/1680
  4. Add the two like fractions:
    80/1680 + 882/1680 = 80 + 882/1680 = 962/1680
  5. 962/1680 simplified gives 481/840
  6. So, 1/21 + 42/80 = 481/840

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