Grade 10 Exam > Grade 10 Notes > Preparation for EmSAT Grade 10 > Important Formulas: Real Numbers
Important Formulas: Real Numbers | Preparation for EmSAT Grade 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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Sep 23, 2025
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