 # Junior High School Math Formulas: Numbers Math formula – In this material, I will discuss about middle school math formula namely the discourse of numbers. Numbers themselves can be interpreted as an idea that has abnormal properties and can provide information about the number of a set of objects. Numbers are usually expressed in numeric form. In mathematics, there are various forms of numbers. Let’s study these numbers one by one.

### Junior High School math formulas about numbers

The original numbers are the set of positive numbers that consist of numbers other than zero (0).
For example: {1,2,3,4,5,6,7,8,9,1,0,11,12,…}
Whole numbers are a set of integers that are positive (not negative) and start from zero.
For example: {0.1.2.3.4.5.6.7.8.9,…}
Integers are a mixed set of whole numbers {0,1,2,3,4,5,…} And also the negative form of these numbers {-1,-2,-3,-4,-5,.. .} Since -0 is equal to 0 then it is enough to just write 0 in the set of integers.
If a, b, and c are integers, then the addition property is: If a, b, and c are integers, then their multiplication property is: The operations of addition and multiplication in the set of integers have distributive properties, namely:
Prime numbers are the set of original numbers that have only 2 factors, 1 and the number itself. The opposite of prime numbers is composite numbers.
For example, 3 is a prime number because 3 only has 2 factors (1 and 3) meaning 3 can only be divided by 1 and 3 and does not produce a fraction. Unlike the number 8, the number 8 is not a prime number because it has more than 2 factors, namely 1, 2, 4, and 8. 1 is also not included in a prime number because it only has one factor, namely the number 1. itself.
The first 20 prime numbers are:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 47, 53, 59, 61, 67, 71, 73, …
You also need to know that the number 2 is the only prime number that is even.
Real numbers are a group of numbers that can be written in decimal form, such as 1.3425 or 8.8452637. Real numbers consist of rational and irrational numbers.

Rational number is a real number which we can write in the form a/b where a and b are integers where b≠0. Examples are 42 and 123/129.

irrational number are real numbers other than rational numbers, for example: (2,34…) and 2

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