# MATHEMATICS: Shortcuts in Multiplication, Division, Addition & Subtraction - secrets in mental math

May 19th, 2015
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There are many useful Math techniques, tricks, and secrets that can be valuable in your day to day work or study. Knowing these shortcuts are key to computation speed and accuracy in your Mental Mathematical Aptitude. This can be useful in applications such as IQ tests, aptitude tests, job application tests, military tests, college entrance tests and so many more uses in the office, workplace, or in your own home.

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MATHEMATICS: Shortcuts inMultiplication, Division, Addition &Subtraction - secrets in mental mathcalculation speed78rate or flag this pageTweet thisBy eternaltreasuresThere are many useful Math techniques, tricks, and secrets that can be valuable in yourday to day work or study. Knowing these shortcuts are key to computation speed andaccuracy in your Mental Mathematical Aptitude. This can be useful in applications suchas IQ tests, aptitude tests, job application tests, military tests, college entrance tests and somany more uses in the office, workplace, or in your own home.MULTIPLICATION:Multiplication using multiples12 x 15= 12 x 5 x 3= 60 x 3= 180Multiplication by distribution12 x 17= (12 x 10) + (12 x 7) ---> 12 is multiplied to both 10 & 7= 120 + 84= 204Multiplication by "giving and taking"12 x 47= 12 x (50 - 3)= (12 x 50) - (12 x 3)= 600 - 36= 564Multiplication by 5 --> take the half(0.5) then multiply by 10428 x 5= (428 x 1/2) x 10 = 428 x 0.5 x 10= 214 x 10= 2140Multiplication by 10 ---> just move the decimal point one place to the right14 x 10= 140 ---> added one zeroMultiplication by 50 ---> take the half(0.5) then multiply by 10018 x 50= (18/2) x 100 = 18 x 0.5 x 100= 9 x 100= 900Multiplication by 100 ---> move the decimal point two places to the right42 x 100= 4200 ---> added two zeroesMultiplication by 500 ---> take the half(0.5) then multiply by 100021 x 500= 21/2 x 1000= 10.5 x 1000= 10500Multiplication by 25

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