Answers

Add 42/40 and 15/84

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

42/40 + 15/84 is 43/35.

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,
   42/40 = 42 × 21/40 × 21 = 882/840
3. Likewise, for the 2nd fraction, since 84 × 10 = 840,
   15/84 = 15 × 10/84 × 10 = 150/840
4. Add the two like fractions:
   882/840 + 150/840 = 882 + 150/840 = 1032/840
5. 1032/840 simplified gives 43/35
6. So, 42/40 + 15/84 = 43/35
   In mixed form: 18/35

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