Mr. R.’s World of Math

window washers math challenge

Lesson: Window Washers
Grade Level: 3 to 5
Skills: Subtraction, addition, division

You’ve just been hired as a window washer for the world’s tallest building. The building has 209 floors. That’s a lot of washing you have to do!!!
You decide to start washing windows from the top floor and work your way down.

You’re able to wash 19 floors a day.

How many days is it going to take you to wash the windows on every floor of the building?

How many (whole) days would it take, if you wash windows on only 14 floors each day? 

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