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Add 80/21 and 20/18

1st number: 3 17/21, 2nd number: 1 2/18

80/21 + 20/18 is 310/63.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 18 is 126
  2. For the 1st fraction, since 21 × 6 = 126,
    80/21 = 80 × 6/21 × 6 = 480/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    20/18 = 20 × 7/18 × 7 = 140/126
  4. Add the two fractions:
    480/126 + 140/126 = 480 + 140/126 = 620/126
  5. 620/126 simplified gives 310/63
  6. So, 80/21 + 20/18 = 310/63
    In mixed form: 458/63

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