The number system is the way we organize and use numbers — like whole numbers, decimals, fractions, integers, and negative numbers.
Think of it as a math family tree — with each branch showing different types of numbers.
Whole numbers: 0, 1, 2
Decimals: 1.5, 0.75
Fractions: 2 over 3
Integers: -4, 0, 5
Rational numbers: any number that can be written as a fraction
Understanding the number system helps us solve real problems, compare values, and move between forms (like turning fractions into decimals or working with negatives).