Answers

Add 72/42 and 15/80

1^st number: 1 30/42, 2^nd number: 15/80

72/42 + 15/80 is 213/112.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 42 × 40 = 1680,
   72/42 = 72 × 40/42 × 40 = 2880/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   15/80 = 15 × 21/80 × 21 = 315/1680
4. Add the two like fractions:
   2880/1680 + 315/1680 = 2880 + 315/1680 = 3195/1680
5. 3195/1680 simplified gives 213/112
6. So, 72/42 + 15/80 = 213/112
   In mixed form: 1101/112

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