Mental Math Trick for Instant Doubling! FAST! is interesting because math is easy and funny, make we laugh and clever in same time. In this chapter we will learn a little bit about Mental Math Trick for Instant Doubling! FAST!

## Description

This Mental Math Trick is the secret to doubling numbers instantly. With this trick you will be able to throw away the calculator (OK that is an exaggeration!)!

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## Video Data

This video has been watched 9.9K views since Published on Jan 29, 2013 until 09-02-2018 09:45:39 and still continue. Duration 5:31 minutes.

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