Tips and Tricks and Shortcuts for Number System

Tips and Tricks for Number System

The subject matter of Profit and loss Questions is quite essential as these questions are there in nearly all competitive exams. It is also included in Aptitude section of many job test in companies like TCS, Infosys etc.This page here on provides Tips and Tricks for Number System.

A Number System is the mathematical notation for representing numbers using digits or other symbols.

Tips and Tricks for Number System

Shortcuts for Number System

  • 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.

Type 1: Tips and Tricks for Number System & 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.

Correct option: A

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

Correct option: B

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

Correct option: A

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

Correct option: B

Question 5. If x and y are odd numbers, then which of the following is always an 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.

Correct option: A

Read Also – How to solve number system problems Quickly

Read Also – Formulas For Number System

Read Also – Questions of Number System

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