# Which Tiles Will Exactly Cover the Grid?

## Opening

# Which Tiles Will Exactly Cover the Grid?

Suppose you want to cover a 12-unit by 18-unit rectangular grid exactly, without any gaps or overlaps. Can you do this using square tile stamps in the following unit sizes?

- 1-unit square tiles? Explain why or why not.
- 5-unit square tiles? Explain why or why not.

INTERACTIVE: Rectangular Grid