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We can find countless rational numbers between two rational numbers. Rational number 0 is the additive identity for all rational numbers because a number does not change when 0 is added to it.
Rational number 1 is the multiplicative identity for all rational numbers because on multiplying a rational number with 1, its value does not change. Addition which is a rational number. Subtraction are rational numbers. Multiplication: are rational numbers. Division : eq. So, rational number are not closed under division. However, if we exclude zero then the rational numbers are closed under division.
Subtraction: Hence, subtraction is not associative for rational numbers. Division: Hence, division is not Cumulative for rational numbers. Multiplication: So, multiplication is associative for rational number, i. Division: Hence, the division is not associative for rational numbers. If we add 0 to the collection of natural numbers, what we get is called the collection of whole numbers.
Natural numbers are also known as positive integers. If we put a negative sign before each positive integer, we get negative integers. Thus, -1, -2, -3, -4, ���. All the above types of numbers are needed to solve various types of simple algebraic equations.
Properties of Rational Numbers The list of properties of rational numbers can be given as follows:. Representation of Rational Numbers on the Number Line. The positive rational numbers are represented by points on the number line to the right of O whereas the negative rational numbers are represented by points on the number line to the left of O.
Any rational number can be represented on this line. The denominator of the rational number indicates the number of equal parts into which the first unit has been divided whereas the numerator indicates as to how many of these parts are to be taken into consideration. Rational Numbers Between Two Rational Numbers We can find infinitely many rational numbers between any two given rational numbers.
We can take the help of the idea of the mean for this purpose. Rational numbers can be represented on a number line. Properties on Rational Numbers i Closure Property Rational numbers are closed under : Addition which is a rational number. Rational numbers are closed under addition subtraction and multiplication. Thus, 0, 1, 2, 3, 4, are whole numbers. Properties of Rational Numbers The list of properties of rational numbers can be given as follows: Closure Commutativity Associativity The role of zero 0 The role of 1 Negative of a number Reciprocal Distributivity of multiplication over addition for rational numbers.
We mark a point O on it and name it 0. Mark a point to the right of 0. Name it 1. The distance between these two points is called unit distance. Mark a point to the right of 1 at unit distance and name it 2.
Proceeding in this manner, we can mark points 3, 4, 5, Similarly we can mark � 1, � 2, � 3, � 4, � 5, ��� to the left of 0. This line is called the number line. This line extends indefinitely on both sides. RD Sharma Class 12 Solutions. Watch Youtube Videos.
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