Answers

Add 40/15 and 72/80

1^st number: 2 10/15, 2^nd number: 72/80

40/15 + 72/80 is 107/30.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 80 is 240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 240
2. For the 1st fraction, since 15 × 16 = 240,
   40/15 = 40 × 16/15 × 16 = 640/240
3. Likewise, for the 2nd fraction, since 80 × 3 = 240,
   72/80 = 72 × 3/80 × 3 = 216/240
4. Add the two like fractions:
   640/240 + 216/240 = 640 + 216/240 = 856/240
5. 856/240 simplified gives 107/30
6. So, 40/15 + 72/80 = 107/30
   In mixed form: 317/30

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