Various of Rational Numbers

1. Rational Numbers consists of:  
The set of negative fractions: {..., -2 / 3, -1 / 5, -3 / 7, ...}
The set of positive fractions: {..., -2 / 3, 1 / 5, 3 / 7, ...}
Numbers zero: {0}
The set of negative integers: {..., -4, -3, -2, -1}
The set of positive integers: {..., 1, 2, 3, 4, 5, 6, 7, ...} 

2. Integer consists of:
Negative integers: {..., -4, -3, -2, -1}
Integer zero: {0}
Positive integers: {..., 1, 2, 3, 4, 5, 6, 7, ...}

3. Numbers Count: {1, 2, 3, 4, 5, 6, 7, ...}
4. Original Numbers: {1, 2, 3, 4, 5, 6, 7, ...}
5. Even Numbers: {0, 2, 4, 6, 8, ...}
6. Odd Numbers: {1, 3, 5, 7, 9, 11, ...}

7. Prime Numbers:
Is the natural numbers which have a place 2 factors 1 and the number itself and 1 does not include prime numbers.
Examples and Evidence primes:

Natural Numbers	The Set of Factors	Total of Factors
1 2 3 9 17 36 57 83 90	{1} {1, 2} {1, 3} {1, 3, 9} {1, 17} {1, 2, 3, 4, 6, 9, 12, 18, 36} {1, 3, 19, 57} {1, 83} {1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90}	1 2 2 3 2 9 4 2 12

Tips and Tricks for Quick Arithmetic

Tips and tricks for fast arithmetic in this blog I present for younger brothers and sisters who are still sitting on the bench than starting elementary school, junior or senior high school.

The source content of this blog is taken from several best-selling book that is dedicated to all people who are interested in studying math is easy.

All this math is always considered a difficult lesson for our younger siblings in school. This is because they do not understand the methods to be applied in studying mathematics. And if you know that mathematics is a lesson that is very exciting and full of mystery in it.

Let us learn math with enjoy and discover the secret on this blog!

WELCOME TO SECRET of Mathematics!