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Add 80/21 and 1/5

1st number: 3 17/21, 2nd number: 1/5

80/21 + 1/5 is 421/105.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 5 is 105
  2. For the 1st fraction, since 21 × 5 = 105,
    80/21 = 80 × 5/21 × 5 = 400/105
  3. Likewise, for the 2nd fraction, since 5 × 21 = 105,
    1/5 = 1 × 21/5 × 21 = 21/105
  4. Add the two fractions:
    400/105 + 21/105 = 400 + 21/105 = 421/105
  5. In mixed form: 41/105

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