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Numbers are fundamental entities that play a crucial role in mathematics and the understanding of the world around us. They represent quantities, magnitudes, and measurements and are essential for counting, calculating, and solving problems in various fields. Different types of numbers exist, each with unique characteristics and applications. The importance of numbers lies in their ubiquity and universality across disciplines. They serve as fundamental tools for scientific research, technological advancements, and everyday life.<br><br>
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TYPES OF NUMBERS MATHEMATICS LESSON DEVELOPER: RAJKUMAR JAIN FOUNDER, EDUSKILLS BY RK eduskillsbyrk.com
INTRODUCTION Numbers are the foundation of mathematics and play a crucial role in various fields. Mathematics is built on numbers which also pervade every area of our life. Numbers are fundamental to our comprehension of the world. In this presentation we will explore different types of numbers and their properties.
NATURAL NUMBERS Counting numbers that start from 1 and continue indefinitely. They are represented as 1, 2, 3, 4, 5, ……. They are used for simple counting and basic arithmetic operations.
WHOLE NUMBERS All natural numbers including zero constitute whole numbers. In other words, counting numbers starting from 0 are called whole numbers. They are denoted as 0, 1, 2, 3, 4, 5…… They are useful in computer programming and counting objects.
INTEGERS They comprise all positive and negative whole numbers including zero. The set of integers is denoted by ….., -3, -2, -1, 0, 1, 2, 3,…. Integers play an important role in algebraic operations and mathematical modelling. All positive and negative numbers including 0 comprise integers.
RATIONAL NUMBERS These numbers can be expressed as fractions, where numerator and denominator are integers and denominator is not zero. In other words, rational number is a number which can be expressed in P/Q form, where p and q are integers and q is not equal to zero. Eg: 1/2, -3/4, 0, 7 etc. Include positive, negative, and zero values. Widely used in ratios and proportions.
IRRATIONAL NUMBERS Cannot be expressed as fractions and have non-repeating, non-terminating decimal expansions. Eg: π (pi), √2, 5.099019513….. etc. They have fascinating properties and are commonly encountered in geometry and trigonometry.
REAL NUMBERS Real numbers encompass both rational and irrational numbers. They form a continuous number line with every possible value. Widely used in scientific calculations and measurements.
IMAGINARY NUMBERS They are represented as multiple of imaginary unit “I”, where “I” is the square root of -1. Let us take an example: 5i, Where, 5 is the real number and I is the imaginary unit. When this number 5i is squared, we will get the negative result as -25. This is because the value of i2 is -1. This means that the √-1=i. The notation “I” is the foundation of all the imaginary numbers. The solution written by using this imaginary numbers in the form a+bi is known as complex numbers. Used to solve certain mathematical problems and are essential in complex number operations.
COMPLEX NUMBERS Combination of real and imaginary numbers. Expressed in the form a+bi, where “a” and ”b” are real numbers, and “I” is the imaginary unit. Widely used in engineering, physics and electrical circuits. Eg: 3+4i, 7-13.6i, 2+I, 0+25i=25i
PRIME NUMBERS Prime numbers are the natural numbers greater than 1 that have no positive divisors other than 1 and themselves. Eg: 2, 3, 5, 7, 11, 13, etc. They are fundamental in number theory and have applications in cryptography and computer science. Cryptography:Method of protecting information and communications through the use of codes.
COMPOSITE NUMBERS Composite numbers are natural numbers greater than 1 that have more than two positive divisors. They can be formed by multiplying two or more prime numbers together. Eg: 4, 6, 8, 9, 10, 12, etc.
POSITIVE AND NEGATIVE NUMBERS Numbers can be classified as positive, negative, or zero. Positive numbers are greater than zero while negative numbers are less than zero, and zero is neither positive nor negative. These concepts are essential in repeating quantities with direction and magnitude, such as temperature, profit, loss etc. Eg: 1, 2, 3, 4, -1, -2, -3, -4, etc.
ODD & EVEN NUMBERS Natural numbers can be categorised as odd or even. Odd numbers are integers that are nor divisible by 2. Eg: 1, 3 , 5, 7, etc. Even numbers are divisible by 2. Eg: 2, 4, 6, 8, etc. Even numbers find applications in various real-world scenarios, such as arranging items in pairs or groups.
TRANSCENDENTAL NUMBERS Transcendental numbers are a subset of real numbers that are neither algebraic nor rational. They cannot be the solution to any non-zero polynomial equation with integer coefficients. Well-known examples: π (pi) and e (Euler’s number). Transcendental numbers have indefinite decimal expansions and do not follow any pattern.
PRIME FACTORISATION Prime factorisation involves expressing a composite number as a product of prime factors. It is a fundamental concept in number theory and is used in various mathematical algorithms. For eg: prime factorisation of 24= 2☓2☓2☓3= 23☓3 FUNDAMENTAL THEOREM OF ARITHMETIC:Every composite number can be expressed (factorised) as a product of primes, and this factorisation is unique, apart from the order in which the prime factors occur.
CONCLUSION Numbers come in various types, each with unique properties and applications. Understanding these types of numbers enriches our mathematical knowledge and problem solving abilities. From natural numbers to complex numbers, numbers play a fundamental role in shaping our understanding of the world. Numbers are not merely abstract concepts but have profound implications in diverse fields of science, technology and everyday life. Continuously exploring the world of numbers unlocks new possibilities and opportunities for innovation and discovery.
