Answers

Add 15/72 and 90/7

1^st number: 15/72, 2^nd number: 12 6/7

15/72 + 90/7 is 2195/168.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 7 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 72 × 7 = 504,
   15/72 = 15 × 7/72 × 7 = 105/504
3. Likewise, for the 2nd fraction, since 7 × 72 = 504,
   90/7 = 90 × 72/7 × 72 = 6480/504
4. Add the two like fractions:
   105/504 + 6480/504 = 105 + 6480/504 = 6585/504
5. 6585/504 simplified gives 2195/168
6. So, 15/72 + 90/7 = 2195/168
   In mixed form: 1311/168

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