
Number System is an integral part of MBA entrance exam syllabus and of other competitive exams too. One needs to master it to be able to not only solve specific questions but also related Mathematical problems. Having complete understanding of decimal number system, binary number system, octal number system and hexadecimal number system is very essential for quick calculations. Number System requires practice as well. Read below all about Number System for MBA entrance exams.
Types of Number Systems:
- Decimal (Base-10): Using ten digits (0-9).
- Binary (Base-2): Using only two digits (0 and 1).
- Octal (Base-8): Uses eight digits (0-7).
- Hexadecimal (Base-16): Uses sixteen digits (0-9 and A-F).
- What is Number Systems?
- Terminating and Non-Terminating Decimal Expansion
- Questions on Number Systems with Solutions
- DILR Practice Questions with Solutions PDFs
- FAQs Regarding Number Systems
What is Number Systems?
Number System can be understood as the method by which we formulate numbers. There are several forms of number systems including binary, decimal, etc. It is a system wherein numbers are expressed. It is the mathematical notation for describing numbers with a consistent sequence of digits or symbols. It proceeds to represent any number and the arrangement of the figures.
Number System Concepts
Here are the definitions of several Number Systems used in calculation.
- Numeral System: It is defined as the way in which numbers are written and represented using digits or symbols.
- Natural Numbers: It refers to positive whole numbers used for counting (example: 1, 2, 3, ...).
- Whole Numbers: It refers tonatural numbers and zero (example: 0, 1, 2, 3, ...).
- Integers: It refers to hole numbers and their negative counterparts (example: -4 -3 -2, -1, 0, 1, 2, 3, 4...).
- Rational Numbers: When numbers are expressed as a fraction p/q, where p and q are integers and q is not zero, then it is called Rational Numbers.
- Real Numbers: It refers to all rational and irrational numbers.
- Complex Numbers: It refers to those numbers that are expressed in the form a + bi, where a and b are real numbers and i is the imaginary unit (√-1).
Number System was an important chapter in Class 9 and 10 Mathematics, and we all are well aware of it. However, to prepare for competitive exams, one needs to study advance level concepts of this chapter.
Terminating and Non-Terminating Decimal Expansion
A rational number either has a finite expansion into rational numbers, or it continues forever.
The decimal expansion of an irrational number is not terminating or recurring.
1. Demonstrate that 0.3333 … = 0.3, may be represented in rational form; i.e, p/q.
Let x = 0.33333.
10 x = 10 × (0.333….) = 3.333....
3.3333... = 3 + x.
10x = 3 + x.
9/x = 3.
x = ⅓.
2. Write the following in decimal form and name expansions.
-
36/100.
-
1/11.
Solution:
-
36/100 = 0.36.
It is terminating.
-
1/11 = 0.09090909…
The solution is non-terminating and repeating.
Illustrated Examples:
1. Multiply 5√3 by 4√3.
Solution: 5√3 x 4√3
5 x 4 x √3 x √3
= 20 x 3
= 60
2. Rationalise the denominator of √3/(√2-√7).
Solution: Multiply both numerator and denominator by √2+√7
[√3/(√2-√7)] x [(√2+√7)/(√2+√7)]
Numerator = √3(√2+√7)
Denominator = (√2-√7)(√2+√7) = (√2)^2-(√7)^2 = 2-7 = -5
Therefore,
[√3(√2+√7)]/-5
= -√3/5(√2+√7)
3. Rationalise the denominator of 1/√5.
Solution: To rationalise the denominator of 1/√5, we need to multiply the numerator and denominator by √5
1/√5 x (√5/√5)
= √5/5
Also Read: MBA Preparation 2025: Tips to Prepare for MBA Entrance Exams
Questions on Number Systems with Solutions
1. What are the five numbers between one and two?
There are 5 rational numbers between one and two.
Solution: We need to find 5 rational numbers between 1 and 2
Divide and multiple both the numbers by (5+1)
Hence,
6/6 and 12/6 are rational numbers now.
Therefore, 6/6, 7/6, 8/6, 9/6, 10/6, 11/6, 12/6.
Irrational numbers cannot be represented as either a fraction or a decimal.
2. Is there a number √3 on the number line?
Solution:
To locate √3 on the number line, we need to:
Build BD that passes via point OB perpendicular to it.
Using Pythagora's theorem, we notice that OD = √((√2)^2+1^2) = √3.
Draw an arc with centre O and radius OD to cut the number line at Q.
Also Read:
| VARC Preparation Tips for MBA Exams | Quantitative Aptitude Preparation Tips for MBA Exams |
DILR Practice Questions with Solutions PDFs
Get here free PDFs of DILR practice questions with solutions. Practice these DILR questions to improve your performance in CAT and other MBA entrance exams:
FAQs Regarding Number Systems
Q: What is the significance of number systems?
Q: Describe the various groups of numbers.
- Natural numbers
- Whole numbers
- Real numbers
- Rational numbers
- Irrational numbers
- Complex numbers
Q: Why are the numbers used?
Q: What are the four different types of number systems?
- Binary number system (base 2 number system)
- Octal number system (base 8 number system)
- Decimal number system (base 10 number system)
- Hexadecimal number system (base 16 number system)
Q: What are the uses of number systems?
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