Question

Add using a number line.

Answer 1

we know that

$1\frac{1}{6} =\frac{(1*6+1)}{6} =\frac{7}{6}$

so

$\frac{5}{6} +(-1\frac{1}{6} )=\frac{5}{6}-\frac{7}{6}=-\frac{2}{6}=-\frac{1}{3}$

therefore

the answer is the letter k

see the attached figure