Answers

Add 81/40 and 15/84

1^st number: 2 1/40, 2^nd number: 15/84

81/40 + 15/84 is 617/280.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 84 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 40 × 21 = 840,
   81/40 = 81 × 21/40 × 21 = 1701/840
3. Likewise, for the 2nd fraction, since 84 × 10 = 840,
   15/84 = 15 × 10/84 × 10 = 150/840
4. Add the two like fractions:
   1701/840 + 150/840 = 1701 + 150/840 = 1851/840
5. 1851/840 simplified gives 617/280
6. So, 81/40 + 15/84 = 617/280
   In mixed form: 257/280

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