Class 10 Exam  >  Class 10 Notes  >  Extra Documents, Videos & Tests for Class 10  >  Important Formulas: Real Numbers

Important Formulas: Real Numbers | Extra Documents, Videos & Tests for Class 10 PDF Download

1. Natural Numbers
N = {1,2,3,4,5  >
It is the counting numbers

2. Whole number
W= {0,1,2,3,4,5>
It is the counting numbers + zero

3. Integers
All whole numbers including Negative number + Positive number  ……-4,-3,-2,-1,0,1,2,3,4,5… so on. Like whole numbers, integers don’t include fractions or decimals.

4. Positive integers
Z+ = 1,2,3,4,5, …

5. Negative integers
Z– = -1,-2,-3,-4,-5, ……

6. Rational Number
A number is called rational if it can be expressed in the form p/q where p and q are integers (q> 0).
Ex: P/q, 4/5

7. Irrational Number
A number is called rational if it cannot be expressed in the form p/q where p and q are integers (q> 0).
Ex: √2, Pi, … etc

8. Real Numbers
A real number is a number that can be found on the number line. Real Numbers are the numbers that we normally use and apply in real-world applications.
Real Numbers include Natural Numbers, Whole Numbers, Integers, Fractions, Rational Numbers and Irrational Numbers

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