A Warehouse store sells cartons of gum. Each carton contains 9 packs of gum, and there are 10 sticks of gum in each pack. Each brown box contains 9 cartons of gum. How many sticks of gum are in 4 brown boxes?

You take the number of brown boxes (4) and multiply by the number of cartons in each box (9) and multiply the number of packs in each carton (9) and then multiply by the number of sticks in each pack (10).

4 x 9 x 9 x 10 = 3,240 sticks of gum in 4 brown boxes