No. It is not correct. When adding fractions, you need to use a common denominator.
Please study my previous answer to this question.
http://www.jiskha.com/display.cgi?id=1248553775
Add:
8/21 + 3/14
Is this correct?
(8+3=11)
(14+ 21=35)
=11/35
3 answers
8/21+3/14
21X4=84
14X6=84
8/84 + 3/84 =11/84
Is this correct?
21X4=84
14X6=84
8/84 + 3/84 =11/84
Is this correct?
No. You used a common denominator. But now you need to find the equivalent fractions. You multiplied 21 by 4 to get the denominator. You also need to multiply the numerator by the same number.
8/21 = 32/84
3/14 = 18/84
32/84 + 18/84 = 50/84 = 25/42
8/21 = 32/84
3/14 = 18/84
32/84 + 18/84 = 50/84 = 25/42