Tom is also tiling a floor. The floor is a rectangle with length 600 cm and width 240 cm
Each tile is a square with side 40 cm
Tom uses this method to work out the number of tiles he needs.
Number of tiles that will fit along the length = 600 - 40
15
Number of tiles that will fit along the width
240 - 40
6
Total number of tiles needed
15 - 6
= 21