Answers

Add 30/75 and 70/21

1^st number: 30/75, 2^nd number: 3 7/21

30/75 + 70/21 is 56/15.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 75 and 21 is 525
   
   Next, find the equivalent fraction of both fractional numbers with denominator 525
2. For the 1st fraction, since 75 × 7 = 525,
   30/75 = 30 × 7/75 × 7 = 210/525
3. Likewise, for the 2nd fraction, since 21 × 25 = 525,
   70/21 = 70 × 25/21 × 25 = 1750/525
4. Add the two like fractions:
   210/525 + 1750/525 = 210 + 1750/525 = 1960/525
5. 1960/525 simplified gives 56/15
6. So, 30/75 + 70/21 = 56/15
   In mixed form: 311/15

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