Answers

Add 20/42 and 2/21

20/42 + 2/21 is 4/7.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 21 is 42
   
   Next, find the equivalent fraction of both fractional numbers with denominator 42
2. For the 1st fraction, since 42 × 1 = 42,
   20/42 = 20 × 1/42 × 1 = 20/42
3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
   2/21 = 2 × 2/21 × 2 = 4/42
4. Add the two like fractions:
   20/42 + 4/42 = 20 + 4/42 = 24/42
5. 24/42 simplified gives 4/7
6. So, 20/42 + 2/21 = 4/7

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