Answers

Add 72/30 and 45/28

1^st number: 2 12/30, 2^nd number: 1 17/28

72/30 + 45/28 is 561/140.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 30 and 28 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 30 × 14 = 420,
   72/30 = 72 × 14/30 × 14 = 1008/420
3. Likewise, for the 2nd fraction, since 28 × 15 = 420,
   45/28 = 45 × 15/28 × 15 = 675/420
4. Add the two like fractions:
   1008/420 + 675/420 = 1008 + 675/420 = 1683/420
5. 1683/420 simplified gives 561/140
6. So, 72/30 + 45/28 = 561/140
   In mixed form: 41/140

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