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# Arithmetic and Number Theory

## Introduction

Arithmetic and number theory are two fundamental branches of mathematics that deal with the properties and relationships of numbers, especially integers. This article will provide an overview of both subjects and highlight their relevance and applications in various fields.

*Return to Mathematics Overview | Return to Overview of What There Is to Know*

## Arithmetic: The Foundation of Numbers

Arithmetic is the most basic form of number manipulation. It involves the basic operations—addition, subtraction, multiplication, and division—as well as understanding the properties of numbers.

### Key Concepts in Arithmetic

**Whole Numbers:**These are numbers without fractions or decimals.**Decimals:**These are numbers that include a fractional component, represented after a decimal point.**Fractions:**Represent a part of a whole and consist of a numerator and a denominator.

## Number Theory: Beyond Basic Arithmetic

Number theory is the study of integers and more generally objects built out of them. It dives deeper into the properties and relationships between numbers.

### Key Concepts in Number Theory

**Prime Numbers:**Numbers greater than 1 that have only two divisors: 1 and the number itself.**Composite Numbers:**Numbers that have more than two divisors.**Factorization:**The process of breaking down a number into its constituent parts.

## Applications

### Arithmetic

**Daily Life:**For basic calculations in shopping, budgeting, and cooking.**Business:**For profit and loss calculations, among others.

### Number Theory

**Cryptography:**Used in encoding and decoding messages.**Computer Science:**Algorithms often use number theoretic concepts.

## Conclusion

Arithmetic and number theory, though seemingly simple, form the backbone of our numerical understanding and have applications that stretch across multiple disciplines.

*Return to Mathematics Overview | Return to Overview of What There Is to Know*