Mr. R.’s World of Math

Chapter 9: Running from The Evil Alien Mr. R. and An Elevator Button…

Running from The Evil Alien Mr. R. and An Elevator Button…

 “Run for it!” yelled Eliza.

“Yeah, I don’t want to go anywhere in any spaceship of math!” yelled Ricardo.

“Yeah, especially 3 days before my birthday!” yelled Regina.

But the Evil Alien Mr. R. was fast and he was catching up to them again. The students were by the elevator and saw the door was open.

“Get in the elevator!” yelled Ally.

“Good idea!” screamed Larry.

The students ran into the elevator and they were trying to close the door before the Evil Alien Mr. R. could get inside with them.

They were pressing the close door button, but it wasn’t working.

They pressed the close door button

7 + 4 + 8 + 2 + 3 + 6 + 5 + 5 + 1 + 9 times.

How many times had they pressed the close door button? (do you see any patterns?)


Enter the number of Times the Students Pressed the Button:

Your results

The students kept pressing the button, but the door still wouldn’t close!

“What are we going to do?” Screamed Ally, Mr. R.’s almost here!”

I don’t know!” yelled Ricardo, “but we better do it fast- that Mr. R. looks even Eviler than he did a minute ago!”

Just as they thought there was no hope,  they saw a sign in the elevator they had never seen before. It said this:

To close the door, press the Close Door button 38 + 37 times, and then scream “Close Door Close!” 5 times!

That’s easy! yelled Larry, “I know 30 + 30 is 60, and I know 8 + 7 is 15, so 60 + 15 is 75!”

The students quickly started pressing the button 75 times as they saw the Evil Alien Mr. R. about to enter the elevator!


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