Add and subtract fractions

Answer all the questions below and press submit to see how many you got right.

id: 4915

$\frac{7}{13}-\frac{2}{13}=\frac{?}{13}?$

id: 4953

What is $\frac{10}{19}-\frac{3}{19}$ as a reduced fraction a/b?

id: 4877

$\frac{3}{17}+\frac{4}{17}=\frac{?}{17}?$