Question

Bob made a square table top with 100 white square tiles. He painted the tiles along the edge of the table red. How many tiles are red?



You must show your work

Answer 1

The table's dimensions are 10 by 10 tiles, making a total of 40 tiles on the edges.

Answer 2

However, if you count all 10 across the top and bottom, then count all 10 on the sides, you have counted the corners twice.

There are only 36 tiles on the edges.

inner area = 8x8 = 64
edges = 36
total = 100

Answer 3

Oops, thanks Steve, for correcting me.

Answer 4

45

Answer 5

I think it is 45.