Answers

Add 90/12 and 80/70

1^st number: 7 6/12, 2^nd number: 1 10/70

90/12 + 80/70 is 121/14.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 70 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 12 × 35 = 420,
   90/12 = 90 × 35/12 × 35 = 3150/420
3. Likewise, for the 2nd fraction, since 70 × 6 = 420,
   80/70 = 80 × 6/70 × 6 = 480/420
4. Add the two like fractions:
   3150/420 + 480/420 = 3150 + 480/420 = 3630/420
5. 3630/420 simplified gives 121/14
6. So, 90/12 + 80/70 = 121/14
   In mixed form: 89/14

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