Answers

Add 15/42 and 45/60

15/42 + 45/60 is 31/28.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 60 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 42 × 10 = 420,
   15/42 = 15 × 10/42 × 10 = 150/420
3. Likewise, for the 2nd fraction, since 60 × 7 = 420,
   45/60 = 45 × 7/60 × 7 = 315/420
4. Add the two like fractions:
   150/420 + 315/420 = 150 + 315/420 = 465/420
5. 465/420 simplified gives 31/28
6. So, 15/42 + 45/60 = 31/28
   In mixed form: 13/28

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