# Tips And Tricks And Shortcuts for Number System

## Number System Tips and Tricks and Shortcuts

Tips and Tricks number system help to answer number system problem effectively.
Whole Number , Natural number and Integers are some common example of number system.
Here, are easy tips and tricks on Number System problems easily, and efficiently in competitive exams.

For example
Ques – π is rational number or irrational
Solution- Yes, π is rational number as it can be written in p/q form. ## Type 1: Number System Tips and Tricks and Shortcuts & General questions

### Question 1

Which one of the following is not a prime number?
Options
A. 51
B. 23
C. 17
D. 11

#### Solution:

51 is divisible by 17. So, it is not a prime number.

### Question 2.

How many prime numbers are there from 1 to 50?
Options
A. 20
B. 15
C. 21
D. 25

#### Solution:

Prime numbers less than 50 are:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47

### Question 3

1198 * 1198 = ?

Options
A. 1435204
B. 1432504
C. 1453204
D. 1435024

#### Solution:

(1198)²
(1200 – 2)²
We can use the identity: (a-b)²= a² + b² – 2ab
(1200)² + 2² – 2 * 1200 * 2
1440000 + 4 – 4800
1435204

### Question 4.

The sum of first five prime numbers is:
Options
A. 20
B. 28
C. 30
D. 25

#### Solution:

Sum of first five prime numbers is = 2+3+5+7+11 = 28

### Question 5.

If x and y are odd numbers, then which of the following is even numbers?
Options
A. x + y
B. xy
C. x – y
D. xy + 2

#### Solution:

The sum of two odd number is always even. So, x + y is even.

### 2 comments on “Tips And Tricks And Shortcuts for Number System”

• Jayprakash Kumar

Where is other questions of number and system 0 0
• PrepInsta Support

Hi Jayprakash,

This is just Tips and Tricks Page and to give you guys basic idea about how to apply those tricks we put several questions here.
To access more Questions, you can find it on Particular Companies Dashboards.

Thanks 0 0