# Calculator Fun 1

1) Think of a two digit number

2) Multiply it successively by 3, 7, 13, and 37

3) What is the result?

For example you r two digit number is 97.

97 x 3 = 291 291 x 7 = 2037 2037 x 13 = 26481 26481 x 37 = 979797

It is the same two digit number repeated three times!

**Why does it work? **

Since 3 x 7 x 13 x 37 = 10101, then any two digit number ab x 10101 = ababab

ab 59x 10101x 10101ab 59 0 0 ab 59 0 0ab59ababab 595959

That is Math, Simple and Cool!

Subscribe to the free *“There’s a Math Teacher in the House”* newsletter at http://events.math-inic.org/TMaTH/