Answers

Add 90/28 and 84/72

1^st number: 3 6/28, 2^nd number: 1 12/72

90/28 + 84/72 is 92/21.

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,
   84/72 = 84 × 7/72 × 7 = 588/504
4. Add the two like fractions:
   1620/504 + 588/504 = 1620 + 588/504 = 2208/504
5. 2208/504 simplified gives 92/21
6. So, 90/28 + 84/72 = 92/21
   In mixed form: 48/21

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