If I’m tiling a floor of a 10’ x 10’ room and find that 100 tiles will be needed how many tiles will be needed to tile a floor of 20’ x 20’ room

400

Step-by-step explanation:

Enough that you will need a large piggy bank to take money out of.\

There are 4 squares of equal size that will fit the floor of a 20 by 20 foot room.

Therefore you will need 4 * 100 = 400 tiles.

You could do it by noting that the floor has 20 by 20 tiles which is 20^2 which is 400.