Khan Academy
Khan Academy: Intro to Rational and Irrational Numbers
Explains what rational and irrational numbers are and the difference between them. [5:55]
PBS
Pbs Learning Media: Converting Rational Numbers
Students learn how to use division and place value to convert fractions to decimals. [1:54]
Khan Academy
Khan Academy: Analyzing Structure Word Problem: Pet Store (2 of 2)
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.
Khan Academy
Khan Academy: Analyzing Structure Word Problem: Pet Store (1 of 2)
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.
Khan Academy
Khan Academy: Adding Rational Expression: Unlike Denominators
Sal rewrites (5x)/(2x-3)+(-4x^2)(3x+1) as (-8x^3+27x^2+5x)/(2x-3)(3x+1).
Khan Academy
Khan Academy: Adding & Subtracting Rational Expressions: Like Denominators
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).
Khan Academy
Khan Academy: Adding & Subtracting Negative Numbers
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).
Khan Academy
Khan Academy: Adding Negative Numbers on the Number Line
Sal shows how to model 6 + (-2) using vertical number lines.
Khan Academy
Khan Academy: Adding Fractions With Different Signs
Use a number line to add fractions with different signs.
Khan Academy
Khan Academy: Adding & Subtracting Fractions
Add and subtract negative fractions with unlike denominators.
Khan Academy
Khan Academy: Adding Negative Numbers Example
Use a number line to add -15 + (-46) + (-29).
Khan Academy
Khan Academy: Adding Numbers With Different Signs
Use a number line to add 15 + (-46) + 29.
Khan Academy
Khan Academy: Addition & Subtraction: Find the Missing Value (Part 1 of 2)
Sal solves some missing value problems: -1 = 7 - __ and -10 + __ = -5 and 4 = -2 + __ and 6 + __ = -8.
Khan Academy
Khan Academy: Addition & Subtraction: Find the Missing Value (Part 2 of 2)
Sal solves more missing value problems: 4 = -8 - __ and __ - (-2) = -7 and -4 = __ - 9.
Khan Academy
Khan Academy: Absolute Value as Distance Between Numbers
In this video, we think about what |a-b| really means, and we verify that |a-b| = |b-a| by looking at an example.
Khan Academy
Khan Academy: Adding & Subtracting Rational Numbers: 0.79 4/3 1/2 + 150%
Sal evaluates 0.79 - 4/3 - 1/2 + 150%.
Khan Academy
Khan Academy: Adding & Subtracting Rational Numbers: 79% 79.1 58 1/10
Sal evaluates 79% - 79.1 - 58 1/10.
Khan Academy
Khan Academy: Adding & Subtracting Decimals Word Problem
Let's get fancy and practice adding and subtracting decimals in the same word problem.
Khan Academy
Khan Academy: Adding Decimals Word Problem
Here's a simple word problem asking us to put our adding decimals skill to work.
Khan Academy
Khan Academy: Adding Decimals: 0.822+5.65
Sal solves 0.822+5.65 using 'standard algorithm'.
Khan Academy
Khan Academy: Adding Decimals: 9.087+15.31
Sal solves 9.087+15.31 using the 'standard algorithm'.
Khan Academy
Khan Academy: Adding Three Decimals
Sal adds 7.056+605.7+5.67 using the 'standard algorithm'.
Khan Academy
Khan Academy: Absolute Value Word Problems
Learn to solve word problems that ask us to apply our new absolute value knowledge.
Khan Academy
Khan Academy: Addition and Subtraction With Significant Figures
Learn to add and subtract with significant figures.