1/6 + 1/3=

2/10 + 4-5=

3/4 - 3/8=

4/7 - 2/14=

Find the lowest common denominator for each of the fractions.

1/3 = 2/6
1/6 + 2/6 = 3/6 = 1/2

I'll be glad to check your answers for the other three problems.