Question

1/10 + 1/5=

Answer 1

3/10??

Answer 2

There is a really handy 'formula' to remember how to add these.
\[\huge {a \over b} \pm {c \over d} = {a*d \pm c*b \over b*d}\]
Where, a, b, c and d can be any number.

Do you think you can do it now?

Answer 3

Yup, it's 3/10. good job.