Saturday, August 28, 2010
Mental Math Tricks to Impress Your Friends
clipped from freestylemind.comMental Math Tricks to Impress Your FriendsHow to multiply any two digits number by 11Example:Square any two digits number that ends with 5Multiply any two digits numbers with the same first digit and the second digit that sums up to 10Note that if the product of the second digits is below ten, you have to add a 0 in front of it.Multiply by 9To multiply by 9, simply multiply by 10 and then subtract the number itself.Quickly find percentagesTo find out the 15% of a nu
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