Answers

Add 20/84 and 5/7

20/84 + 5/7 is 20/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 7 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 84 × 1 = 84,
   20/84 = 20 × 1/84 × 1 = 20/84
3. Likewise, for the 2nd fraction, since 7 × 12 = 84,
   5/7 = 5 × 12/7 × 12 = 60/84
4. Add the two like fractions:
   20/84 + 60/84 = 20 + 60/84 = 80/84
5. 80/84 simplified gives 20/21
6. So, 20/84 + 5/7 = 20/21

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