What am I doing wrong with this adding fractions problem: $\frac{5}{6} + \frac{2}{3}$?

Question

The problem is $$\frac{5}{6} + \frac{2}{3}$$

I found the LCD which is $6$. Then I multiplied $2\times 3=6$ and $2\times 2=4$. So the new problem is $$\frac{5}{6} + \frac{4}{6} = \frac{11}{6}$$ $\frac{11}{6}$ simplified is $1 \frac{5}{6}$ but that's not an answer I can select.

Actually $5+4=11$. The OP was using octal arithmetic. However, in octal arithmetic $11/6$ simplifies to $1\frac{1}{2}$. — Oscar Lanzi, Sep 14 '17 at 16:08
@OscarLanzi as long as were making silly/snarky quips I'd respond to "but that's not an answer I can select" with "you could if you were really persistent". — fleablood, Sep 14 '17 at 16:39

score 1 · Answer 1 · answered Nov 03 '18 at 05:31

1

As Kenny Lau so thoughtfully pointed out, $5+4=9$. $$\frac{5}{6}+\frac{2}{3}=\frac{5}{6}+\frac{4}{6}=\frac{9}{6}=\frac{3}{2}$$

answered Nov 03 '18 at 05:31

Robert Howard

2,753

What am I doing wrong with this adding fractions problem: $\frac{5}{6} + \frac{2}{3}$?

1 Answers1