Instructional Video
Study Pug

Study Pug: Understanding the Number Systems

9th - 10th Standards
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...
Instructional Video
Study Pug

Study Pug: Multiplying Fractions and Whole Numbers

5th - 7th Standards
This video walks you through the four main steps when multiplying fractions with whole numbers. Includes explanations, examples and practice problems. [1:00]
Instructional Video
Khan Academy

Khan Academy: Classifying Numbers: Rational and Irrational

7th - 8th Standards
Given a set of numbers, learn how to tell which are rational and which are irrational. [2:17]
Instructional Video
Khan Academy

Khan Academy: Intro to Rational and Irrational Numbers

8th Standards
Explains what rational and irrational numbers are and the difference between them. [5:55]
Instructional Video
PBS

Pbs Learning Media: Converting Rational Numbers

6th - 7th Standards
Students learn how to use division and place value to convert fractions to decimals. [1:54]
Instructional Video
Khan Academy

Khan Academy: Analyzing Structure Word Problem: Pet Store (2 of 2)

10th
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.
Instructional Video
Khan Academy

Khan Academy: Analyzing Structure Word Problem: Pet Store (1 of 2)

10th
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.
Instructional Video
Khan Academy

Khan Academy: Adding Rational Expression: Unlike Denominators

10th
Sal rewrites (5x)/(2x-3)+(-4x^2)(3x+1) as (-8x^3+27x^2+5x)/(2x-3)(3x+1).
Instructional Video
Khan Academy

Khan Academy: Adding & Subtracting Rational Expressions: Like Denominators

10th
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).
Instructional Video
Khan Academy

Khan Academy: Adding & Subtracting Negative Numbers

7th
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).
Instructional Video
Khan Academy

Khan Academy: Adding Negative Numbers on the Number Line

7th
Sal shows how to model 6 + (-2) using vertical number lines.
Instructional Video
Khan Academy

Khan Academy: Adding Fractions With Different Signs

7th
Use a number line to add fractions with different signs.
Instructional Video
Khan Academy

Khan Academy: Adding & Subtracting Fractions

7th
Add and subtract negative fractions with unlike denominators.
Instructional Video
Khan Academy

Khan Academy: Adding Negative Numbers Example

7th
Use a number line to add -15 + (-46) + (-29).
Instructional Video
Khan Academy

Khan Academy: Adding Numbers With Different Signs

7th
Use a number line to add 15 + (-46) + 29.
Instructional Video
Khan Academy

Khan Academy: Addition & Subtraction: Find the Missing Value (Part 1 of 2)

7th
Sal solves some missing value problems: -1 = 7 - __ and -10 + __ = -5 and 4 = -2 + __ and 6 + __ = -8.
Instructional Video
Khan Academy

Khan Academy: Addition & Subtraction: Find the Missing Value (Part 2 of 2)

7th
Sal solves more missing value problems: 4 = -8 - __ and __ - (-2) = -7 and -4 = __ - 9.
Instructional Video
Khan Academy

Khan Academy: Absolute Value as Distance Between Numbers

7th
In this video, we think about what |a-b| really means, and we verify that |a-b| = |b-a| by looking at an example.
Instructional Video
Instructional Video
Instructional Video
Khan Academy

Khan Academy: Adding & Subtracting Decimals Word Problem

6th
Let's get fancy and practice adding and subtracting decimals in the same word problem.
Instructional Video
Khan Academy

Khan Academy: Adding Decimals Word Problem

6th
Here's a simple word problem asking us to put our adding decimals skill to work.
Instructional Video
Khan Academy

Khan Academy: Adding Decimals: 0.822+5.65

6th
Sal solves 0.822+5.65 using 'standard algorithm'.
Instructional Video
Khan Academy

Khan Academy: Adding Decimals: 9.087+15.31

6th
Sal solves 9.087+15.31 using the 'standard algorithm'.