One step word problems

Last week 3,456 viewers watched T.V. This week 1,256 watched T.V. How many viewers altogether?

There are 125 rows on the airplane. There are 9 seats in each row. How many seats altogether?

Diana bought 36 slices of pizzas. The pizzas equally by 9 people. How many slices each get? 

The DVD store has 4,567 movies. They sold 423 movies. How many movies are left?

The school choir has 48 singers, 24 band members and 28 helpers. How many people are there?