Answers

Add 70/21 and 15/45

1^st number: 3 7/21, 2^nd number: 15/45

70/21 + 15/45 is 11/3.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 45 is 315
   
   Next, find the equivalent fraction of both fractional numbers with denominator 315
2. For the 1st fraction, since 21 × 15 = 315,
   70/21 = 70 × 15/21 × 15 = 1050/315
3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
   15/45 = 15 × 7/45 × 7 = 105/315
4. Add the two like fractions:
   1050/315 + 105/315 = 1050 + 105/315 = 1155/315
5. 1155/315 simplified gives 11/3
6. So, 70/21 + 15/45 = 11/3
   In mixed form: 32/3

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