04/04/2014

Mental Maths DIVISION Techniques and Tricks


Hi, welcome to nrrbeassistance.blogspot.comMental Maths DIVISION Techniques, Tricks and Shortcuts for the jobs, bank exams RBI / SBI / IBPS CWE / RRB, etc. Useful in the preparation of quantitative aptitude &/ numerical ability for the pupil preparing probationary officers (PO) / specialist officer (SO) / manager / assistants / clerks posts and others.

Mental Maths DIVISION Techniques, Tricks and Shortcuts

Techniques:
Dividing by 5, 50, 500, and etc.: Multiply by 2 and then divide by 10, 100, 1000, and etc.
Ex.: 365/5 = 730/10 = 73

Dividing by 25, 250, 2500, and etc.: Multiply by 4 and divide by 100, 1000, 10000, and etc.

Dividing by 125: Multiply by 8 and then divide by 1000
Ex.: 36125/125 = 289000/1000 = 289

Tricks and Shortcuts:
It can be divided evenly by:
  • 2 if the number ends in 0, 2, 4, 6, and 8
  • 3 if the sum of the digits in the number is divisible by 3
  • 4 if the number ends in 00 or a 2 digit number divisible by 4
  • 5 if the number ends in 0 or 5
  • 6 if the number is even and the sum of the digits is divisible by 3
  • 7 sorry, you must just try this one
  • 8 if the last three digits are 000 or divisible by 8
  • 9 if the sum of the digits are divisible by 9
  • 10 if the number ends in 0
  • 11 if the number has an even number of digits that are all the same: 33, 4444, 777777, and etc.
  • 11 if, beginning from the right, subtracting the smaller of the sums of the even digits and odd digits results in a number equal to 0 or divisible by 11: 
  •  Ex.: 406857/11 Even = 15 Odd = 15 = 0
  • Ex.: 1049807/11 Even = 9 Odd = 20 = 11
  • 12 if test for divisibility by 3 & 4 work
  • 15 if test for divisibility by 3 & 5 work
Others by using tests above in different multiplication combinations

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