See how the different categories of numbers all relate to one another by watching this tutorial. [6:05]

This lesson demonstrates how to solve various problems with negative fractions and decimals as well as dividing a fraction or mixed number by a fraction. [6:35]

This lesson introduces how to change fractions into decimals. Also explains the difference between rational and irrational numbers. [10:26]

This lesson explains what rational numbers are and the different types, i.e., whole numbers, fractions, decimals, and negative fractions. [5:35]

In this lesson, you will learn how to find the absolute value of a number by using a number line. [3:46]

Learn about the rules for multiplying a positive integer by a negative integer by using the distributive property. [3:55]

This tutorial shows you how to find rational numbers between two rational numbers. [3:24]

In this video tutorial, Professor Perez uses a real number line to demonstrate integers, natural numbers, rational and irrational numbers, and whole numbers. [8:17]

In this video students learn to represent a number as a decimal, percent, and fraction.

In this lesson students learn about ordering numbers expressed as decimals, fractions, and percentages.

Numbers can be categorized more specifically into different number systems, for instances, natural numbers, whole numbers, integers, rational numbers, and irrational numbers. In this video, you will learn how to classify numbers into...

This video walks you through the four main steps when multiplying fractions with whole numbers. Includes explanations, examples and practice problems. [1:00]

Given a set of numbers, learn how to tell which are rational and which are irrational. [2:17]

Explains what rational and irrational numbers are and the difference between them. [5:55]

Students learn how to use division and place value to convert fractions to decimals. [1:54]

Sal solves a word problem about the unknown number of bears, cats, and dogs in a pet store. This is part 2 where Sal uses an algebraic reasoning.

Sal solves a word problem about the unknown number of bears, cats, and dogs in a pet store. This is part 1 where Sal uses a visual reasoning.

Sal rewrites (5x)/(2x-3)+(-4x^2)(3x+1) as (-8x^3+27x^2+5x)/(2x-3)(3x+1).

Sal adds 6/(2x^2-7) + (-3x-8)/(2x^2-7) and subtracts (9x^2+3)/(14x^2-9) - (-3x^2+5)/(14x^2-9).

Learn how to add and subtract negative numbers. The problems solved in this video are 2 - 3 = -1 and -2 - 3 = -5 and -2 + 3 = 1 and 2 - (-3) = 5 and -2 - (-3).

Sal shows how to model 6 + (-2) using vertical number lines.

Use a number line to add fractions with different signs.

Add and subtract negative fractions with unlike denominators.

Use a number line to add -15 + (-46) + (-29).