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Math Calculation for magical methods Tricks



Hello dosto examgoalguru me aapka swagat hai. ham aaj apko batayege math se related kuchh yaise tricks ke bare me jo SSC CGL, CHSL, Bank PO etc. exam me aapkeliye helpful hoga.




Calculation for magical methods Tricks
Trick1 :
How to find square of a number ending with 5?
Kisi bhi number ke end me 5 ho jaise 25 , 35 , 45, 55, 65, 105, 225 etc. 

Esme se ham 45 ko lete hai
Multiply 5 by 5 = 25 as your right part of the answer.
Multiply 4 by the next digit  5 (4*5)= 20
Your answer is 2025
Ab ham 115*115 lete hai
5*5=25
11*12=132
Answer is 13225
Es prakar ap es trick se square nikal sakte hai jiske end mai 5 ho.
Trick2 :
  ab ham bat karte hai kisi  number ka squar kaise nikalte hai
Rule- (10a + b)2 = 100a2 + 10(2ab) + b2
Step1- 1. Square the one’s digit. Write this number down, carry if necessary.
2. Multiply the one’s digit with the ten’s digit and multiply by 2. Write this
number down, carry if necessary.
3. Square the ten’s digit. Write this number down.
Ex.1- 322 =
a)   22 =4. Write 4
b)    2 X 3=6. 6 x 2=12 write 2, carry *1
c)   32 =9 + *1= 10 write 10.
d)   The answer is 1024.


Ex2- 782 =
a)   8 2 =64 write 4, carry *6.
b)    7 x 8= 56. 56 x 2 = 112 + *6 = 118. Write 8, carry *11.
c)   72 = 49 +*11 = 60 write 60.
d)   The answer is 6084.


Yah method 3 digit numbers ko bhee adapt karta hai.
Ex. 1232 =
a)   Think of 123 as (12)3 where 12 is the number in the ten’s digit.
b)   32 =9 write 9.
c)   12 X 3 = 36. 36 X 2= 72. Write 2, xarry *7.
d)   122 = 144 +*7 = 151. Write 151.
e)   The answer is 15129.

   Trick 3:
Squaring A 2-Digit Number:
Ab ham apko bataye ki 2 digit number ke squar kaise nikalte hai:
Ex [1] 322 =_________.
a) 22 = 4. Write 4.
b) 2 x 3 = 6. 6 x 2 = 12. Write 2, carry *1.
c) 32 = 9 + *1 = 10. Write 10.
d) The answer is 1024.

Ex [2] 782 =_________.
a) 82 = 64. Write 4, carry *6.
b) 7 x 8 = 56. 56 x 2 = 112 + *6 = 118. Write 8, carry *11.
c) 72 = 49 + *11 = 60. Write 60.
d) The answer is 6084.

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