Answers

Add 21/42 and 81/98

21/42 + 81/98 is 65/49.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 98 is 294
   
   Next, find the equivalent fraction of both fractional numbers with denominator 294
2. For the 1st fraction, since 42 × 7 = 294,
   21/42 = 21 × 7/42 × 7 = 147/294
3. Likewise, for the 2nd fraction, since 98 × 3 = 294,
   81/98 = 81 × 3/98 × 3 = 243/294
4. Add the two like fractions:
   147/294 + 243/294 = 147 + 243/294 = 390/294
5. 390/294 simplified gives 65/49
6. So, 21/42 + 81/98 = 65/49
   In mixed form: 116/49

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