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!
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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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.