240
He will need 240 tiles.
2400
1 decimeter=0.1 meters
10 000
1 decimeter=0.1 meters
1 decimeter=0.1 meters
1 decimeter=0.1 meters
1 decimeter=0.1 meters
You would need 137 (136.23) 16" x 16" tiles to cover 22.5 square meters.
1 decimeter=0.1 meters
1 decimeter=0.1 meters
1 decimeter=0.1 meters