Answers

Add 15/72 and 90/84

1^st number: 15/72, 2^nd number: 1 6/84

15/72 + 90/84 is 215/168.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 84 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 84 × 6 = 504,
   90/84 = 90 × 6/84 × 6 = 540/504
4. Add the two like fractions:
   105/504 + 540/504 = 105 + 540/504 = 645/504
5. 645/504 simplified gives 215/168
6. So, 15/72 + 90/84 = 215/168
   In mixed form: 147/168

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