Answers

Add 72/30 and 28/21

1^st number: 2 12/30, 2^nd number: 1 7/21

72/30 + 28/21 is 56/15.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 30 and 21 is 210
   
   Next, find the equivalent fraction of both fractional numbers with denominator 210
2. For the 1st fraction, since 30 × 7 = 210,
   72/30 = 72 × 7/30 × 7 = 504/210
3. Likewise, for the 2nd fraction, since 21 × 10 = 210,
   28/21 = 28 × 10/21 × 10 = 280/210
4. Add the two like fractions:
   504/210 + 280/210 = 504 + 280/210 = 784/210
5. 784/210 simplified gives 56/15
6. So, 72/30 + 28/21 = 56/15
   In mixed form: 311/15

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