Answers

Add 50/15 and 70/21

1^st number: 3 5/15, 2^nd number: 3 7/21

50/15 + 70/21 is 20/3.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 21 is 105
   
   Next, find the equivalent fraction of both fractional numbers with denominator 105
2. For the 1st fraction, since 15 × 7 = 105,
   50/15 = 50 × 7/15 × 7 = 350/105
3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
   70/21 = 70 × 5/21 × 5 = 350/105
4. Add the two like fractions:
   350/105 + 350/105 = 350 + 350/105 = 700/105
5. 700/105 simplified gives 20/3
6. So, 50/15 + 70/21 = 20/3
   In mixed form: 62/3

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