Question 1: Installing tiles

Susie wants to tile the floor of her family’s rectangular play room. The tiles she plans to use are 10 cm by 10 cm squares. A drawing of the room is shown below. How many of the square tiles will Susie need to cover the floor of the play room?

Show your work.

Question #2: The carpenter and the missing stairs

A carpenter is replacing some missing steps at the front of Dena’s house. The bottom three steps are missing. He wants to use the same heights for the new steps as the old steps. The carpenter measures the height from the ground to the top of each remaining step.


• The fourth step is 66 cm from the ground.
• The fifth step is 82.5 cm from the ground.
• The sixth step is 99 cm from the ground.

The carpenter plans to make each step increase by the same amount. What are the heights of the first, second and third steps? Show your work and explain.