Question

Which tiles can be used to cover a 12 by 12 floor? 9 by 9? Suppose you have 2 by 2, 3 by 3, 4 by 4, and 5x by 5 ft tiles.
Anonymous
The x isn't supposed to be there.
Ms. Sue
Only one of those sets would not work. Which one wouldn't work?

Anonymous
Um I don't really know.
Ms. Sue
Here are the factors of 12:

1, 2, 3, 4, 6, 12

Factors of 9

1, 3, 9

Anonymous
I got the 9x9 but whats the 12x12?
Ms. Sue
Look at the factors of 12. All but one size of floor tile will cover a 12 by 12 foot floor.