28 Aug 2016

Fast Math Tricks for Multiplication of 3-Digits Number - Download in PDF

Fast Math Tricks for Multiplication of 3-Digits Number- Download in PDF
Fast Math Tricks for Multiplication of 3-Digits Number- Download in PDF:
Dear Readers, In Banking exams time management is an important key point for success, it will be more challenging to attend all the questions in given time, particularly in Aptitude Section most of the aspirants spending more time to solve it. For fast calculation there are so many Aptitude Shortcuts and Mind Tricks, we IBPS Guide taking special steps to provide you more Shortcuts for both Aptitude Questions and Simplification. Here we have given a Fast Math Tricks for the Multiplication of 3-Digits Number.

Note: This method of multiplication may look quite complicated, but if you practice it regularly, it will help you to Save Time during Examination.

EXAMPLE 1:
783×654 =?
GIVEN:
N1 = 783; N2 = 654

SOLUTION:

STEP 1:

One’s digit of the product is obtained by multiplying the one’s digits of N1 and N2

One’s digit of product = [One’s digit of N1 × One’s digit of N2]
= [3×4]
12
‘1’ is taken as carry to the Step 2 i.e., C1 = 1

STEP 2:

Ten’s digit of product = [Ten’s digit of N1×One’s digit of N2] +
                                      [One’s digit of N1×Ten’s digit of N2] + C1

                                   = [8×4] + [3×5] + 1
                                   = 32 + 15 + 1
                                    = 48
‘4’ is taken as the carry to Step 3 i.e., C2 = 4

STEP 3:

To calculate the hundredth digit of the product
[Hundredth digit of N1×One’s digit of N2] + [Ten’s digit of N1 × Ten’s digit of N2] + [One’s digit of N1×Hundredth digit of N2] + C2

= [7×4] + [8×5] + [3×6] + 4
= [28] + [40] + [18] + 4
90
Here, ‘9’ is taken has carry i.e., C= 9
Adding the products of above 3 steps we get

STEP 4:

To calculate the thousand digit of the product
[Hundredth digit of N1×Ten’s digit of N2] + [Ten’s digit of N1 × Hundredth digit of N2] + C3
= [7×5] + [8×6] + 9
= [35] + [48] + 9
92

Here, ‘9’ is taken has carry i.e., C= 9
Add the Products of the above 2-steps. At the end of Step 4 we have

STEP 5:

To calculate the remaining digit of the product
[Hundredth digit of N1×Hundredth digit of N2] + C4
= [7×6] + 9
= [42] + 9
51

Therefore, 783×654 = 512082

Check Below for More Math Shortcut Rules:

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