Answers

Add 90/7 and 40/80

1^st number: 12 6/7, 2^nd number: 40/80

90/7 + 40/80 is 187/14.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 7 and 80 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 7 × 80 = 560,
   90/7 = 90 × 80/7 × 80 = 7200/560
3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
   40/80 = 40 × 7/80 × 7 = 280/560
4. Add the two like fractions:
   7200/560 + 280/560 = 7200 + 280/560 = 7480/560
5. 7480/560 simplified gives 187/14
6. So, 90/7 + 40/80 = 187/14
   In mixed form: 135/14

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