Adding and subtracting fractions

So now that you understand equivalent fractions, improper fractions, mixed fractions and how to simplify fractions let's learn about adding and subtracting fractions.

We know that 3/5 + 1/5 = 4/5 because if we add the numerators together we get 4. So because the denominators are the same it shows that we are adding the same size pieces together, but what if we have to add fractions together that have different denominators e.g

Try solving these fraction equations
1/3 + 2/5 =
6/7 + 3/5 =
2/9 + 6/4 =