# Number Sense Blog

By Mathnasium | Added Aug 29, 2018

Would you ever want to live in Oz? We think it might be pretty interesting to land in this amazing, magical world! In this week’s word problem challenge, use your elementary school math skills such as addition, subtraction, division, fractions, and percents to figure out how much one young girl and one little dog would increase the population of a small town in Oz.

Keep your wits about you, beware the wicked witch, and when you're ready, check below for the solution!

Question: The population of Munchkinland is 200 before Dorothy and Toto’s house hits the ground, landing on and squashing the Wicked Witch of the East. By what percent does the population increase when Dorothy and Toto arrive in Munchkinland? (Yes, we are counting Toto as a part of the population.)

Solution: The population of Munchkinland increases by 1: we add 2 for Dorothy and Toto and subtract 1 for the squished witch. A percentage is out of 100. To turn 1 out of 200 into a percent, we divide both numbers by 2 and get ½ out of 100. That’s ½%.

(Image above by W.W. Denslow, from The Wonderful Wizard of Oz by L.Frank Baum)

### Favorites

Bedtime Math: http://bedtimemath.org/

National PTA: http://www.pta.org/

NCTM: http://www.nctm.org/

Numberphile: http://www.numberphile.com/

PTO Today: http://www.ptotoday.com/

STEM Connector: http://blog.stemconnector.org/

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