Answers

Add 90/12 and 80/72

1^st number: 7 6/12, 2^nd number: 1 8/72

90/12 + 80/72 is 155/18.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 72 is 72
   
   Next, find the equivalent fraction of both fractional numbers with denominator 72
2. For the 1st fraction, since 12 × 6 = 72,
   90/12 = 90 × 6/12 × 6 = 540/72
3. Likewise, for the 2nd fraction, since 72 × 1 = 72,
   80/72 = 80 × 1/72 × 1 = 80/72
4. Add the two like fractions:
   540/72 + 80/72 = 540 + 80/72 = 620/72
5. 620/72 simplified gives 155/18
6. So, 90/12 + 80/72 = 155/18
   In mixed form: 811/18

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