Question

Which tiles can be used to cover a 12 by 12 floor?

A.2 by 2
B.3 by 3
C.4 by 4
D.5 by 5
Which tiles can be used to cover a 9 by 9 floor?
A.2 by 2
B.3 by 3
C.4 by 4
D.5 by 5

Answer 1

in each case, the tile width/length must divide the floor width/length, respectively.