Answers

Add 80/21 and 2/5

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

80/21 + 2/5 is 442/105.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 5 is 105
   
   Next, find the equivalent fraction of both fractional numbers with denominator 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,
   2/5 = 2 × 21/5 × 21 = 42/105
4. Add the two like fractions:
   400/105 + 42/105 = 400 + 42/105 = 442/105
5. So, 80/21 + 2/5 = 442/105
   In mixed form: 422/105

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