Answers

Add 15/40 and 75/42

1^st number: 15/40, 2^nd number: 1 33/42

15/40 + 75/42 is 121/56.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 42 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 40 × 21 = 840,
   15/40 = 15 × 21/40 × 21 = 315/840
3. Likewise, for the 2nd fraction, since 42 × 20 = 840,
   75/42 = 75 × 20/42 × 20 = 1500/840
4. Add the two like fractions:
   315/840 + 1500/840 = 315 + 1500/840 = 1815/840
5. 1815/840 simplified gives 121/56
6. So, 15/40 + 75/42 = 121/56
   In mixed form: 29/56

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