Answers

Add 90/12 and 81/80

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

90/12 + 81/80 is 681/80.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 80 is 240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 240
2. For the 1st fraction, since 12 × 20 = 240,
   90/12 = 90 × 20/12 × 20 = 1800/240
3. Likewise, for the 2nd fraction, since 80 × 3 = 240,
   81/80 = 81 × 3/80 × 3 = 243/240
4. Add the two like fractions:
   1800/240 + 243/240 = 1800 + 243/240 = 2043/240
5. 2043/240 simplified gives 681/80
6. So, 90/12 + 81/80 = 681/80
   In mixed form: 841/80

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