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Add 7/21 and 63/80

7/21 + 63/80 is 269/240.

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,
    7/21 = 7 × 80/21 × 80 = 560/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    63/80 = 63 × 21/80 × 21 = 1323/1680
  4. Add the two like fractions:
    560/1680 + 1323/1680 = 560 + 1323/1680 = 1883/1680
  5. 1883/1680 simplified gives 269/240
  6. So, 7/21 + 63/80 = 269/240
    In mixed form: 129/240

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