Answers

Add 90/28 and 10/72

1^st number: 3 6/28, 2^nd number: 10/72

90/28 + 10/72 is 845/252.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 72 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 28 × 18 = 504,
   90/28 = 90 × 18/28 × 18 = 1620/504
3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
   10/72 = 10 × 7/72 × 7 = 70/504
4. Add the two like fractions:
   1620/504 + 70/504 = 1620 + 70/504 = 1690/504
5. 1690/504 simplified gives 845/252
6. So, 90/28 + 10/72 = 845/252
   In mixed form: 389/252

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