Answers

Add 2/5 and 40/21

1^st number: 2/5, 2^nd number: 1 19/21

2/5 + 40/21 is 242/105.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 5 and 21 is 105
   
   Next, find the equivalent fraction of both fractional numbers with denominator 105
2. For the 1st fraction, since 5 × 21 = 105,
   2/5 = 2 × 21/5 × 21 = 42/105
3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
   40/21 = 40 × 5/21 × 5 = 200/105
4. Add the two like fractions:
   42/105 + 200/105 = 42 + 200/105 = 242/105
5. So, 2/5 + 40/21 = 242/105
   In mixed form: 232/105

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