A meeting room has 8 rows of chairs. Each row has 10 chairs. The first people to arrive fill 2 rows. How many chairs are not filled?

Question

Do we need to multiply then subtract? Not sure of this common core question for 3rd grade.

Answer 1

Fannie,

Yes multiply then subtract.

 

8*10 = 80 chairs

2 rows of 10 are filled, that's 2*10 = 20

 

80 - 20 = 60 chairs not filled