Saturday, October 13, 2018

100+ math short tricks for competitive exam //math pdf file download









হ্যালো বব্ধুরা কেমন আছ?
আপনি হইত competitive exam  এর জন্য প্রস্তুতিও শুরু করে দিয়েছেন.তাহলে আপনি একদম ঠিক জায়গায় এসেছেন । আজ  আমরা আপনাদের  জন্য নিয়ে এসেছি 100+ math short tricks  পিডিএফ টি ডাউনলোড করে প্রাকটিস করুন . আর পরবর্তী গণিত   পিডিএফ ফাইলQUESTION গুলি পাতে আমাদের WEBSITE এ প্রতিদিন ভিসিট করুন.

PDF এর কিছু নমুনা প্রশ্ন উত্তর সমূহ নিচে দেয়া হলো  : 


1. Method to multiply 2-digit number.
(i) AB × CD = AC / AD + BC / BD
35 × 47 = 12 / 21 + 20 / 35 = 12 / 41 / 35 = 1645
(ii) AB × AC = A2 / A (B + C) / BC
74 × 76 = 72 / 7(4 + 6) / 4 × 6
= 49 / 70 / 24 = 49 / 70 / 24 = 5624
(iii) AB × CC = AC / (A + B)C / BC
= 35 × 44 = 3 × 4 / (3 + 5) × 4 / 5 × 4
= 12 / 32 / 20 = 12 / 32 / 20 = 1540

2. Method to multiply 3-digit no.
ABC × DEF = AD / AE + BD / AF + BE + CD / BF + CE / CF
456 × 234 = 4 × 2 / 4 × 3 + 5 × 2 / 4 × 4 + 5 × 3 + 6 × 2 / 5 × 4 + 6 × 3 / 6 × 4
= 8 / 12 + 10 / 16 + 15 + 12 / 20 + 18 / 24
= 8 / 22 /43 / 38 / 24 = 106704
3. If in a series all number contains repeating 7. To find their sum, we start from the left multiply 7 by 1, 2, 3, 4, 5 & 6. Look at the
example below.
777777 + 77777 + 7777 + 777 + 77 + 7 = ?
= 7 × 1 / 7 × 2 / 7 × 3 / 7 × 4 / 7 × 5 / 7 × 6
= 7 / 14 / 21 / 28 / 35 / 42 = 864192
4. 0.5555 + 0.555 + 0.55 + 0.5 = ?
To find the sum of those number in which one number is repeated after decimal, then first write the number in either increasing
or decreasing order. Then -find the sum by using the below method.
0.5555 + 0.555 + 0.55 + 0.5
= 5 × 4 / 5 × 3 / 5 × 2 / 5 × 1
= 20 / 15 / 10 / 5 = 2.1605
5 Those numbers whose all digits are 3.
(33)2 = 1089 Those number. in which all digits are number is 3 two or more than 2 times repeated, to find the square of
these number, we repeat 1 and 8 by (n – 1) time. Where n ® Number of times 3 repeated.
(333)2 = 110889
(3333)2 = 11108889
6. Those number whose all digits are 9.
(99)2 = 9801
(999)2 = 998001
(9999)2 = 99980001
(99999)2 = 9999800001
7. Those number whose all digits are 1.
A number whose one’s, ten’s, hundred’s digit is 1 i.e., 11, 111, 1111, ....
In this we count number of digits. We write 1, 2, 3, ..... in their square the digit in the number, then write in decreasing order up to 1.
112 = 121
1112 = 12321
11112 = 1234321
S-2 101 Shortcuts in Quantitative Aptitude
8. Some properties of square and square root:

(i) Complete square of a no. is possible if its last digit is 0, 1, 4, 5, 6 & 9. If last digit of a no. is 2, 3, 7, 8 then complete square root
of this no. is not possible.
(ii) If last digit of a no. is 1, then last digit of its complete square root is either 1 or 9.
(iii) If last digit of a no. is 4, then last digit of its complete square root is either 2 or 8.
(iv) If last digit of a no. is 5 or 0, then last digit of its complete square root is either 5 or 0.
(v) If last digit of a no. is 6, then last digit of its complete square root is either 4 or 6.
(vi) If last digit of a no. is 9, then last digit of its complete square root is either 3 or 7.
9. Prime Number :
(i) Find the approx square root of given no. Divide the given no. by the prime no. less than approx square root of no. If given
no. is not divisible by any of these prime no. then the no. is prime otherwise not.
For example : To check 359 is a prime number or not.
Sol. Approx sq. root = 19
Prime no. < 19 are 2, 3, 5, 7, 11, 13, 17
359 is not divisible by any of these prime nos. So 359 is a prime no.
For example: Is 25001 + 1 is prime or not?
25001 1
2 1
+
Þ
+
Reminder = 0,
\ 25001 + 1 is not prime.
(ii) There are 15 prime no. from 1 to 50.
(iii) There are 25 prime no. from 1 to 100.
(iv) There are 168 prime no. from 1 to 1000.
10. If a no. is in the form of xn + an, then it is divisible by (x + a); if n is odd.
11. If xn ¸ (x – 1), then remainder is always 1.
12. If xn ¸ (x + 1)
(i) If n is even, then remainder is 1.
(ii) If n is odd, then remainder is x.
13. (i) Value of
P P P .......... 4P 1 1
2
+ +
+ + + ¥ =
(ii) Value of
P P P .......... 4P 1 1
2
+ -
- - - ¥ =
(iii) Value of P. P. P. ..........¥ = P
(iv) Value of ( ) 2n 1 2n
P P P P P P
- ¸
=

[Where n ® no. of times P repeated].

Note: If factors of P are n & (n + 1) type then value of P + P + P +....¥ = (n +1) and P - P - P -....¥ = n.


পিডিএফ ডাউনলোড করবার জন্য নিচে যান 



আরো পড়ুন :



পিডিএফ ফাইল এ  সম্পুর্ণ প্রশ্ন পাবেন -উত্তর করে দেওয়া আছে 

পিডিএফ ফাইল টি কেমন লাগলো কমেন্ট বাক্স এ জানাবেন  . আপনাদের মতামত পেলে আমরা উতসাহিত হব 

নিচে পিডিএফ ফাইল টি ডাউনলোড করুন 


PDF FILE DETAILS


FILE NAME:100+ math short tricks (gksolved.com )
FILE SIZE :396 KB 
DOWNLOAD: CLICK HERE 

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