Help Algebra
Help algebra.com: The Real Number System
Natural numbers, whole numbers, integers and rational numbers begin this lesson on the real number system. You can also learn more about the number line and absolute value. Examples and diagrams are included to enhance understanding.
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Number Systems
Find a quick, concise explanation of Real Numbers. Other number systems are also defined such as: Natural, Integer, Rational, Irrational and Complex Numbers.
National Institute of Educational Technologies and Teacher Training (Spain)
Ministerio De Educacion: El Monosabio
This application has a simulation which computes the product of two numbers and the square of a number.
Other
Ministerio De Educacion: Suma Y Resta
Practice your mental math by finding two numbers knowing their sum and difference.
National Institute of Educational Technologies and Teacher Training (Spain)
Ministerio De Educacion: Resta Y Producto
Practice your mental math by finding two numbers knowing their difference and product.
National Institute of Educational Technologies and Teacher Training (Spain)
Ministerio De Educacion: Calculo Mental Todo Terreno
Practice your mental math with this application by finding the sum of two: whole numbers, integers, decimals or fractions. You can choose two different levels of difficulty.
Math Planet
Math Planet: Integers and Rational Numbers
Gain an understanding of integers and rational numbers by viewing an example and a video lesson.
Math Planet
Math Planet: Algebra 1: Integers and Rational Numbers
Provides an example and a video lesson that illustrates integers and rational numbers.
Math Open Reference
Math Open Reference: Number
Resource defines numbers into two main categories, counting numbers and scalars. It also gives examples of number notation.
Other
The Real Number System
The subsets of the real number system are organized in an easy-to-read table. Use the questions at the bottom of the page as an assignment to check for understanding.
CK-12 Foundation
Ck 12: Algebra: Basics of Real Numbers Study Guide
This comprehensive study guide highlights the main terms and formulas needed to understand the basics of real numbers. Examples are included.
Cuemath
Cuemath: Natural Numbers
We see numbers everywhere around us - measuring the temperature, counting money, telling the time, etc. The numbers that are used for counting objects are called "natural numbers". This article explains the properties of natural numbers...
Cuemath
Cuemath: Composite Numbers
In this article, you will learn the difference between prime and composite numbers, the smallest composite number, and odd composite numbers. Included are solved examples and interactive problems for review.
Cool Math
Coolmath: Number Systems
This CoolMath resource will teach students about natural numbers, positive numbers, and whole numbers.
Other
Chili Math: How to Classify Real Numbers
Explains how to classify real numbers and provides numerous examples.
Other
Interactive Real Analysis: Natural Numbers, Integers, Rationals
A rigorous definition of natural numbers, integers, and rationals numbers, using advanced mathematics language. Contains links to proofs.
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Natural Numbers
Find a quick, concise explanation of what a natural number is. An example is given and clearly explained. Also, a diagram is presented to show what the relationship of natural numbers is to other number groups.
Purple Math
Purplemath: Number Types
This site explores the different types of numbers: natural numbers, whole numbers, integers, and rational and irrational numbers. Content includes some practice questions.
Tech Target
Rational Number: A Whatis Definition
A very good and in-depth explanation of what a rational number is.
Other
Matematicas Para Ninos: El Huevo De Chocolate (The Chocolate Egg)
This resource provides basic math activities in Spanish. Topics include division, math riddles and correcting equations.
Math Open Reference
Math Open Reference: Cardinal Numbers
Learn about cardinal numbers with this handy reference guide. Provides detailed definitions and examples that enhance further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Counting Numbers
Learn about counting numbers with this helpful reference tool. Provides a detailed definition and includes links to related topics.
University of Utah
University of Utah: The Number System
This site from The University of Utah provides a definition of commonly used numbers including rational numbers, natural numbers, integers, real and complex numbers and more.