Question

chapter 1st real number class 9th all defination and all formulas​

Answer 1

Step-by-step explanation:

Real numbers are the numbers which include both rational and irrational numbers. Rational numbers such as integers (-2, 0, 1), fractions(1/2, 2.5) and irrational numbers such as √3, π(22/7), etc., are all real numbers.

Answer 2

Answer:

real numbers

real numbers: A real number is a number that can be found on number line

different types of numbers

1)natural numbers: the numbers that are used for counting . it starts from' 1 'onwards

2)whole number: a whole number is either a counting number or zero

★ all whole numbers are not natural number but all natural number are whole numbers

3)integers: an integer is either a whole number or its negative

positive integers : starting from one and so on

negative integers: starting from -1 and so on

4) even numbers: the numbers divisible by 2 or multiple of 2 is called Even Numbers example 2 ,4,6,8

5) odd number: the number which is not divisible by 2 is called odd numbers example 1,3,57,13,15 .

6)prime numbers : the number which is divisible by itself and 1 is called prime number 2 is the smallest prime number 2 is the only even prime number .

7)composite numbers: a composite number is a positive integer that can be formed by multiplying two smaller positive integers . equivalently it is a positive integer that has at least one division other than one and itself ( 4 is the smallest composite number )

8) rational numbers: are rational number is a number that can be written as a ratio of two integers it is in the form of p/q here p and q are integers and q not equal to zero example - 1 / 8, - 4,0,3 /7 ,9 etc. rational number maybe with terminating decimal like 3/ 8, divided by 0.375 or it may be with non terminating recurring decimal like 2/3 divided by 0.666

9) irrational numbers : the numbers which cannot be expressed in the form of p by q where p and q are integers and q is not equal to zero are called irrational numbers are non terminating and non-repeating .

★ rational numbers and irrational numbers together form real numbers

10) fraction: a fraction is a part of the whole number in the number line there located between integers

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