Summer is almost here and most animals are migrating back to cooler countries. There are 8 bird families living near a mountain. If 43 new bird families joined them How many bird families live near the mountain now?
There are 8 bird families living near a mountain. 

43 new bird families joined them. 

How many bird families live near the mountain now?

There are 8 + 43 = 51 bird families living near the mountain now.