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1800-102-2727Rational numbers: - Rational numbers can be represented in the p/q form, where p and q are integers, and q is not equal to 0. p can be a positive, negative, or even a zero integer.
Example – 2/3, 5/6
Irrational numbers: - In simple terms, the numbers which are not rational are called irrational numbers. Strictly speaking, the numbers represented in decimal but not in the fractional form are called irrational numbers. It is because they have an endless set of repeating or non-repeating terms after the decimal point.
Example – The value of the square root of 2 = 1.41421356537…
The given Venn diagram shows the relation between rational and irrational numbers.
Find four rational numbers between 2/5 and ½.
Solution
To find rational numbers between a given set of numbers, let us make the denominator equal first.
Taking LCM of 5 and 2, we get 10.
Making the fraction equal as – 2/5 x 2/2 = 4/10
And, ½ x 5/5 = 5/10
Since the numbers 4 and 5 are adjacent numbers, we need to make the denominator bigger enough to find four rational numbers.
Therefore, 2/5 x 10/10 = 20/50
And, ½ x 25/25 = 25/50
Now, we can easily find four rational numbers between 20/50 and 25/50. Four rational numbers are – 21/50, 22/50, 23/50 and 24/50.
Rational numbers | Irrational numbers |
They can be expressed in the form of p/q. | It cannot be expressed in the form of a fraction or a ratio. |
The decimal expansion may be terminating/non-terminating or recurring in nature. | The decimal expansion is non-terminating and non-recurring. |
Example, 0.3333, 1.25 | Example, pi, e and square root of 3. |