For my *mathematically - able *readers, here's something to exercise you prefrontal cortex on. The rest of you can use a calculator but I'd like to remind you to press the right button or you'll try to use that excuse for getting it wrong. ;-)

We thought that this problem would be a good brain teaser for students in our 9th grade classes.

Here it is:

*There were seven girls on a bus and each girl had seven backpacks. **Each backpack contained seven large cats and each large cats had seven smaller cats with them. **How many legs are on the bus? *

This is the original problem. The answer to this problem was used as a password for an EXCEL answer sheet file HERE.

Our problem has a little twist to it... we wanted to add the driver's legs as well! Also, to distinguish the math nerds from the math-nerds-wanna-be's we added an extension to it. After showing proficiency that students can answer the first part, as shown above, they now have to write an algebraic phrase or a general rule for *n* number of legs on the bus when *n* girls are present on the bus, provided the pattern follows, plus the bus driver's leg!

Goodluck, tfr!

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