Answers

Add 21/84 and 4/56

21/84 + 4/56 is 9/28.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 56 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 84 × 2 = 168,
   21/84 = 21 × 2/84 × 2 = 42/168
3. Likewise, for the 2nd fraction, since 56 × 3 = 168,
   4/56 = 4 × 3/56 × 3 = 12/168
4. Add the two like fractions:
   42/168 + 12/168 = 42 + 12/168 = 54/168
5. 54/168 simplified gives 9/28
6. So, 21/84 + 4/56 = 9/28

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