## Did you know?

Here is a fun fact to demonstrate to your students:

*Think of two positive integers.*

Add them to get a third number.

Add the second number and the third number to get a fourth number.

Continue in this way until you have 10 numbers.

The sum of the 10 numbers is 11 times the seventh number.

found via Futility Closet

This entry was posted on Monday, December 1st, 2014 at 8:30 am and is filed under Algebra, trick.
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