Answers

Add 81/15 and 70/40

1^st number: 5 6/15, 2^nd number: 1 30/40

81/15 + 70/40 is 143/20.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 40 is 120
   
   Next, find the equivalent fraction of both fractional numbers with denominator 120
2. For the 1st fraction, since 15 × 8 = 120,
   81/15 = 81 × 8/15 × 8 = 648/120
3. Likewise, for the 2nd fraction, since 40 × 3 = 120,
   70/40 = 70 × 3/40 × 3 = 210/120
4. Add the two like fractions:
   648/120 + 210/120 = 648 + 210/120 = 858/120
5. 858/120 simplified gives 143/20
6. So, 81/15 + 70/40 = 143/20
   In mixed form: 73/20

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