Answers

Add 84/42 and 15/40

1^st number: 2 0/42, 2^nd number: 15/40

84/42 + 15/40 is 19/8.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 40 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 42 × 20 = 840,
   84/42 = 84 × 20/42 × 20 = 1680/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   15/40 = 15 × 21/40 × 21 = 315/840
4. Add the two like fractions:
   1680/840 + 315/840 = 1680 + 315/840 = 1995/840
5. 1995/840 simplified gives 19/8
6. So, 84/42 + 15/40 = 19/8
   In mixed form: 23/8

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