Shuffle the math strips.
Choose any number of math strips.
Place the strips one beside the other.
Instantly add the strips.
Ask participant to verify the answer by adding the strips.

Example #1:
In the video we randomly chose three strips.
The answer is 2672.
Question: How can this answer be found so rapidly?

PS:
This is a great activity for "Math Activity Night"
Involve parents...ask students take the math strips home.

How to to find the answer:
Look at the third row.
In the video the third row numbers are: 674
Place the number "2" at the beginning of the number: 2674
Subtract "2" from the last digit (4 -2 = 2 )
The prediction is: 2672