Answers

Add 90/12 and 81/40

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

90/12 + 81/40 is 381/40.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 40 is 120
   
   Next, find the equivalent fraction of both fractional numbers with denominator 120
2. For the 1st fraction, since 12 × 10 = 120,
   90/12 = 90 × 10/12 × 10 = 900/120
3. Likewise, for the 2nd fraction, since 40 × 3 = 120,
   81/40 = 81 × 3/40 × 3 = 243/120
4. Add the two like fractions:
   900/120 + 243/120 = 900 + 243/120 = 1143/120
5. 1143/120 simplified gives 381/40
6. So, 90/12 + 81/40 = 381/40
   In mixed form: 921/40

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