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Today we read 20 most important Number system question with best short trick .
Let's Start.......💫💫⭐⭐
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Translation baar is given at right top corner .✅✅✅
Question:1⭐⭐⭐⭐⭐⭐⭐⭐⭐
Solve this √3×√27= ?
Answer:
=√3×√27=√81=9
Note: you should remember that
1. √a×√b = √ab⭐
2.√(-a)×√b= -√ab=√a×√(-b)
3.√(-a) × √(-b)= -√ab
1. √a×√b = √ab⭐
2.√(-a)×√b= -√ab=√a×√(-b)
3.√(-a) × √(-b)= -√ab
Question 2.
(√-3)×(√-27) =?
Answer:
Now we solve this question
=(√-3)×(√-27)= √(-3)×√(-3)×√(-3)×√(-3)= (-9)
Very important question
Such type answer will be only use (-) sign
Divisibility rules
Divisibility by 2:
If the unit digit of a number has the digits 0,2,4,6,8, then that number will be completely divisible by 2.
Example:
20,,52,24,56,68, unit digit is 0,2,4,6,8
Then these numbers are always divisible by 2.
Divisibility by 4:
If the last two digit of a number is completely divisible by 4 or last two digit will be( 00 )then this number will be completely divisible by 4.⭐⭐
Example:
64,784, 6500 ,5788179764
784= 84 is completely divisible by 4 then this number is completely divisible by 4.
5788179764: here last two digit is 64 which is completely divisible by 4 ,then this number will be completely divisible by 4.⭐⭐
Divisibility by 8⭐
If the last three digit of a number is completely divisible by 8 or last three digit will be( 000)then this number will be completely divisible by 8.⭐⭐
Divisibility by 8⭐
If the last three digit of a number is completely divisible by 8 or last three digit will be( 000)then this number will be completely divisible by 8.⭐⭐Example:
064,872,10872,1000
10872:last three digit 872 is completely divisible by 8 then this number will be completely divisible by 8.
Divisibility by 2⋯⋯⋯⋯⋯⋯⋯⋯⋯ only unit digit of a number or last only one (0)
Divisibility by 4⋯⋯⋯⋯⋯⋯⋯⋯⋯last two digit of a number or last only two(00)
Divisibility by 8⋯⋯⋯⋯⋯⋯⋯⋯⋯ last three digit of a number or only last three zero (000)
Divisibility by 3:
If the sum of the digits of a number is completely divisible by 3, then that number will be completely divisible by 3.
Example:
165 ,186,198,12586962
Check now:
165=1+6+5=12 is completely divisible by 3,then 165 will be completely divisible by 3.
Same as
12586962
=1+2+5+8+6+9+6+2=39 ,is completely divisible by 3. Then
This number will be completely divisible by 3.
Divisibility by 6:
If a number is completely divisible by both 2 and 3 then this number will be completely divisible by 6.
Example:
654,678978
654, unit digit 4,then will be completely divisible by 2
And 6+5+4=15 is completely divisible by 3,then 654 will be completely divisible by 3.
654 is completely divisible by both 2 and 3.
Then it will be completely divisible by 6.
Divisibility by 9:
If add of digit of a number (digit sum) is completely divisible by 9 then ,this number will be completely divisible by 9.
Example:
6579,52578
Add of digit (digit sum)=27, is completely divisible by 9.then these numbers are completely divisible by 9.⭐⭐
Divisibility by 5.
If unit digit of a number is either 0 or 5 then this number will be completely divisible by 5.
Example:
535,500,540
Divisibility by 7:✅
a number is completely divisible by 7 when we subtract last digit multiply by 2 from number if final results is completely divisible by 7 then this number will be completely divisible by 7.
Example:
343,2401
343= 34-2×3=34-6=28
Is completely divisible by 7then this number will be completely divisible by 7.
2401=240-2×1=240-2=238=23-2×8=23-16=7 ,is completely divisible by 7 then 2401 is completely divisible by 7.
Content list:
Number system for ssc
Number system for ssc gd
Number system question
Number system for ssc cgl
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