Answers

Add 15/84 and 1/20

15/84 + 1/20 is 8/35.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 20 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 84 × 5 = 420,
   15/84 = 15 × 5/84 × 5 = 75/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   1/20 = 1 × 21/20 × 21 = 21/420
4. Add the two like fractions:
   75/420 + 21/420 = 75 + 21/420 = 96/420
5. 96/420 simplified gives 8/35
6. So, 15/84 + 1/20 = 8/35

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