8th grade math
Learn eighth grade math—functions, linear equations, geometric transformations, and more. (aligned with Common Core standards)
7 units209 videos17 hours
Learn it live with a class on Puzzicle · Teachers: use it with your class
Unit 1: Numbers and operations
Repeating decimals
Square roots & cube roots
Irrational numbers
Approximating irrational numbers
Exponents with negative bases
Exponent properties intro
Exponent properties (integer exponents)
Working with powers of 10
Scientific notation intro
Arithmetic with numbers in scientific notation
Unit 2: Solving equations with one unknown
Equations with variables on both sides
Equations with parentheses
Number of solutions to equations
Equations word problems
Unit 3: Linear equations and functions
Graphing proportional relationships
Rates & proportional relationships example ✓ Check-ins1:25
Rates & proportional relationships: gas mileage ✓ Check-ins3:19
Graphing proportional relationships: unit rate ✓ Check-ins4:31
Graphing proportional relationships from a table ✓ Check-ins1:12
Graphing proportional relationships from an equation ✓ Check-ins3:09
Solutions to linear equations
Intercepts
Slope
Intro to slope ✓ Check-ins6:56
Slope & direction of a line ✓ Check-ins2:35
Positive & negative slope ✓ Check-ins5:02
Worked example: slope from graph ✓ Check-ins4:40
Slope of a line: negative slope ✓ Check-ins4:00
Worked example: slope from two points ✓ Check-ins7:12
Slope from equation ✓ Check-ins6:19
Converting to slope-intercept form ✓ Check-ins5:07
Slope of a horizontal line ✓ Check-ins5:05
Intro to slope-intercept form
Graphing slope-intercept form
Writing slope-intercept equations
Functions
What is a function? ✓ Check-ins7:57
Worked example: Evaluating functions from equation ✓ Check-ins0:59
Function notation example ✓ Check-ins2:13
Worked example: Evaluating functions from graph ✓ Check-ins0:44
Equations vs. functions ✓ Check-ins4:18
Manipulating formulas: temperature ✓ Check-ins2:41
Obtaining a function from an equation ✓ Check-ins3:04
Linear models
Linear graphs word problems ✓ Check-ins5:05
Linear graphs word problem: cats ✓ Check-ins2:43
Linear equations word problems: volcano ✓ Check-ins5:58
Linear equations word problems: earnings ✓ Check-ins4:03
Modeling with linear equations: snow ✓ Check-ins4:58
Linear function example: spending money ✓ Check-ins5:22
Fitting a line to data ✓ Check-ins7:48
Comparing linear functions
Comparing linear functions: equation vs. graph ✓ Check-ins2:23
Comparing linear functions: same rate of change ✓ Check-ins2:36
Comparing linear functions: faster rate of change ✓ Check-ins3:40
Comparing linear functions word problem: climb ✓ Check-ins4:44
Comparing linear functions word problem: walk ✓ Check-ins3:44
Comparing linear functions word problem: work ✓ Check-ins3:46
Constructing linear models for real-world relationships
Recognizing functions
Testing if a relationship is a function ✓ Check-ins2:23
Relations and functions ✓ Check-ins6:57
Recognizing functions from graph ✓ Check-ins4:07
Checking if a table represents a function ✓ Check-ins1:16
Recognizing functions from table ✓ Check-ins4:40
Checking if an equation represents a function ✓ Check-ins3:33
Does a vertical line represent a function? ✓ Check-ins1:40
Recognizing functions from verbal description ✓ Check-ins1:31
Recognizing functions from verbal description word problems ✓ Check-ins3:23
Unit 4: Systems of equations
Intro to systems of equations
Systems of equations with graphing
Systems of equations with graphing ✓ Check-ins8:30
Systems of equations with graphing: y=7/5x-5 & y=3/5x-1 ✓ Check-ins2:22
Systems of equations with graphing: 5x+3y=7 & 3x-2y=8 ✓ Check-ins6:35
Systems of equations with graphing: chores ✓ Check-ins5:19
Systems of equations with graphing: exact & approximate solutions ✓ Check-ins5:56
Solving systems with substitution
Systems of equations with substitution: 2y=x+7 & x=y-4 ✓ Check-ins4:39
Systems of equations with substitution: y=4x-17.5 & y+2x=6.5 ✓ Check-ins4:06
Systems of equations with substitution: -3x-4y=-2 & y=2x-5 ✓ Check-ins4:21
Systems of equations with substitution: 9x+3y=15 & y-x=5 ✓ Check-ins6:04
Systems of equations with substitution: y=-5x+8 & 10x+2y=-2 ✓ Check-ins3:44
Systems of equations with substitution: y=-1/4x+100 & y=-1/4x+120 ✓ Check-ins3:44
Number of solutions to systems of equations
Systems of equations number of solutions: fruit prices (1 of 2) ✓ Check-ins9:25
Systems of equations number of solutions: fruit prices (2 of 2) ✓ Check-ins7:08
Solutions to systems of equations: dependent vs. independent ✓ Check-ins5:10
Number of solutions to a system of equations ✓ Check-ins3:26
Number of solutions to a system of equations graphically ✓ Check-ins6:36
Number of solutions to a system of equations algebraically ✓ Check-ins6:01
How many solutions does a system of linear equations have if there are at least two? ✓ Check-ins2:12
Systems of equations word problems
Age word problem: Imran ✓ Check-ins3:43
Age word problem: Ben & William ✓ Check-ins6:28
Age word problem: Arman & Diya ✓ Check-ins5:21
System of equations word problem: walk & ride ✓ Check-ins7:00
System of equations word problem: no solution ✓ Check-ins5:03
System of equations word problem: infinite solutions ✓ Check-ins5:01
Systems of equations with substitution: coins ✓ Check-ins5:58
Unit 5: Geometry
Angles between intersecting lines
Triangle angles
Angles in a triangle sum to 180° proof ✓ Check-ins4:28
Isosceles & equilateral triangles problems ✓ Check-ins6:27
Triangle exterior angle example ✓ Check-ins6:03
Worked example: Triangle angles (intersecting lines) ✓ Check-ins4:55
Worked example: Triangle angles (diagram) ✓ Check-ins5:42
Triangle angle challenge problem ✓ Check-ins8:37
Triangle angle challenge problem 2 ✓ Check-ins6:05
Pythagorean theorem
Pythagorean theorem application
Pythagorean theorem and distance between points
Pythagorean theorem proofs
Unit 6: Geometric transformations
Transformations intro
Translations
Reflections
Properties & definitions of transformations
Dilations
Unit 7: Data and modeling
Introduction to scatter plots
Interpreting scatter plots
Estimating lines of best fit
Learn this with a class
With a class on Puzzicle this course runs as a timetable of live study parties: your batch watches together and answers the check-ins, sometimes with a teacher leading.
Course content © Khan Academy, used under CC BY-NC-SA. See this course on Khan Academy.