The Rule of 72 - Doubling Time of an Investment
The Rule of 72: Annual Rate or Return Needed to Double Investment
Inflation and The Rule of 72: Time for Money to be Worth Half of its Value Under Inflation
Find the Percent of Change
Divide Fractions Using a Common Denominator
Find the Quotient of Two Percentages as a Percent
Related Rates: Find the Rate of Change in the Water Height as it Drains from a Right Circular Cone
SAT Math Prep: Find the Value of a Computer after 3 Years (Constant Rate of Decrease)
Metric Conversion Shortcut (Single Digit)
SAT Math Prep: Find an Average Cost Given a Ratio of Item Purchased by Two People
SAT Math Prep: Determine the Value of an Expression Given a Linear Equation
SAT Math Prep: Determine x if y = 2 and 49=(xy-3)^2
SAT Math Prep: Simplify an Expression to Determine a Difference of Coefficients
SAT Math Prep: Find a y-coordinate of a Point on a Line Given the Intercepts
SAT Math Prep: Given a Linear Equation in One Variable, Find the Value of an Expression
SAT Math Prep: Find a Base Angle of an Isosceles Triangle in a Diagram
SAT Math Prep: Simplify and Find a Difference of Complex Numbers
SAT Math Prep: Find a Missing Constant in Two Equivalent Quadratic Expressions
SAT Math Prep: Complete the Square on a Quadratic Expression
SAT Math Prep: Find an Equivalent Expression with Radical and Rational Exponents
SAT Math Prep: Given the Roots of a Cubic Equation, Determine the Factors of the Cubic
SAT Math Prep: Find the x-coordinate of the Vertex Given a Quadratic Function in Factored Form
SAT Math Prep: Which Ordered Pair Satisfies a System of Equations
SAT Math Prep: Determine a Function Value of a Rational Function
SAT Math Prep: Find the Interval of the x-coordinate of a Quadratic Function (Factored Form)
SAT Math Prep: Given Two Equivalent Quadratic Expressions, Find a Missing Constant M#1
SAT Math Prep: Given Two Equivalent Quadratic Expressions, Find a Missing Constant M#2
SAT Math Prep: Perform Synthetic Division to Find a Quotient
SAT Math Prep: Find x - y Given a System of Equations
Divisibility Rule for 3
Pattern Multiplying a 2 Digit Number by 11 (Sum of Digits Less than 10)
Divisibility Challenge: Find the Missing Digits
Squaring Numbers with Digits of 1
SAT Math Prep: Review Exponential Decay Function - Country's Declining GCP
SAT Math Prep: Interpret a Constant in a Function Modeling Population
Pattern Multiplying a 2 Digit Number by 11 (Advanced)
SAT Math Prep: Find a Percent of Minutes in Seconds
SAT Math Prep: Find a Missing Angle from a Diagram
Connect The Same Colored Dots without Intersecting Curves
The World Population Reaches 8 Billion!
Graph a Piecewise Defined Function
Evaluate an Expression Based Upon Two Equations
Simplify an Expression Using the Order of Operation: 8/2(2+2)
Find the Reciprocal of a Square root of a Fraction
Simplify a Square Root Expression Using Exponent Rules
Determine the Product to Two Square Roots
Does 0.999… = 1?
SAT Math Prep: Find the Center and Radius of a Circle Given an Equation of a Circle
SAT Math Prep: Determine x Given 3 Exponential Equations
SAT Math Prep: Given f(x+3) = 4x + 5, Determine f(x)
SAT Math Prep: Given f(x+3) = 4x + 5, Determine f(1)
The Monty Hall Problem: Switch Doors or Not?
SAT Math Prep: Find an Expression for the Area Between a Square and Circle
SAT Math Prep: Determine x from an Equation with Many Fractions
SAT Math Prep: Simplify the Sum of Exponential Terms
SAT Math Prep: Find the Area of the Shaded Region of a Rectangle
SAT Math Prep: Given an Equation, Determine the Value of an Exponential Expression (1)
SAT Math Prep: Given an Equation, Determine the Value of an Exponential Expression(2)
SAT Math Prep: Given an Equations, Determine the value of an Expression
SAT Math Prep: Simplify an Expression with Powers of i, the imaginary unit
SAT Math Prep: Determine the Length of a Side of a Right Trapezoid Using the Pythagorean Theorem
SAT Math Prep: Write an Equation from Works and then Determine 3x
Math Challenge: Simplify and Square Root Expression Using Factoring
Stick Multiplication 1: 15*13
Stick Multiplication 2: 23*16
Area of a Sector
Lattice Multiplication: 2 digit times 2 digit
Lattice Multiplication: 3 digit times 2 digit
The Most Beautiful Equation: Euler's Identity
Alternative Method to Add Fractions with Unlike Denominators
Trick Math Problem: Give the Cost of 2 Items and One is $6 More, How Much is the Other Item?
Find a Linear Function Value Given a Table Without the Function Value
Given an Ordered Pair of a Parametric Function, Determine the Function of x
Common Error: Simplifying Fractions
Can You Cut a Cake Into 8 Pieces With Three Cuts?
What 2D Shape Has Maximum Area? What 3D Shape has Maximum Volume?
Interesting Math Facts about Large Numbers
Interesting Math Facts: Four, One, Zero, and Temperatures
Interesting Math Facts: Forty, One, and Palindrome Numbers
Challenge: What Day Is It?
Determine the Fraction of a Square That is Shaded
How To Quickly Add 1 to 100
Exponential Equation Challenge
Square Root Equation Challenge
Equation Challenge: Solve an Exponential Equation with Square Roots
SAT/ACT Practice: Simplify Fraction Raised to Negative Rational Exponent
SAT/ACT Practice: Solve an Equation with a Complex Fraction
Write Numbers Using Scientific Notation
Converting Scientific Notation to Decimal Notation
SAT/ACT Practice: Area of Region in a Rectangle and Outside Circles
SAT/ACT Practice: Exponent Properties Challenge
SAT/ACT Practice: Evaluate a Rational Expression Using Exponent Properties and a Given Equation
SAT/ACT Practice: Given a System of Equations, Find the Value of an Expression
Solve an Equation With an Absolute Value Using Exponent Properties
Express a Interval Using an Inequality and Interval Notation
Find the Area of a Rectangle Inside a Right Triangle
Find the Value of a Logarithm Using a System of Equations
Find a Percent of Change: Increase in Price of Gas
Pi Day is March 14th! 3/14
Number Line Intervals Using Inequalities and Interval Notation
Date and Time 50 Hours after a Given Day and Time
Date and Time 56 Hours after a Given Day and Time
Find a Percent of Change: Decrease in Car Value
Equation Challenge: Solve a Rational Equation with a Complex Fraction
(Trig Review) Trigonometric Function Values Using a Right Triangle
Simplify an Expression: A Product of a Sum of x's
(Trig Review) Find the Perimeter of a 30-60-90 Right Triangle Given the Short Leg
(Animation) The Sum of the Interior Angles of Any Triangle
Determine the Area of a Shaded Region Inside of a Square
(Trig) Determine the Length of a Leg of a Right Triangle Given an Angle and the Hypotenuse
Geometry: Find a Missing Interior Angle of a Triangle
Area Challenge: Find the Area of a Polygon With Sides of Missing Length
Challenge: Evaluate an Absolute Value Expression
Evaluate the Cube of an Expression Given an Equation
Find a Missing Value Given an Average of Values
Find the Interior Angles of a Pentagon
Perimeter Challenge: Find the Perimeter of a Polygon with Sides of Missing Length
Challenge: Evaluate the Sum of Fractions with Square Roots
Find the Measure of a Missing Interior Angle of a Quadrilateral
Find a Missing Interior Angle of a Triangle Given an Interior and Exterior Angle
Absolute Value Expression Challenge
Find Consecutive Integers Given the Sum
Math Challenge: Find the Value of An Expression Given an Equation
Most Commonly Missed Exponent Rules (Product and Power to Power)
Algebra Review: Find a Missing Constant of Function Given a Function Value
Algebra Review: Determine a Difference of Function Values
Sequence Challenge: Find the Next Letter in a Sequence
Common Error: Simplify an Expression Using the Order of Operations
Challenge: Simplify an Expression with Percentages
Equation Challenge: Solve a Radical Equation
Exponent Challenge: Simplify an Sum of Exponential Terms with Exponents Raised to Exponents
Simplify a Quotient of Factorials
Determine the Fraction of a Square That is Shaded
Percent Challenge: 60% of 80 is What Percent of 200?
Product of Square Roots Challenge: Negative Radicands
Equation Challenge: Using an Equation in Two Variables to Find the Sum of Two Variables
Find the Measure of an Exterior Angle of a Triangle Using Given Information
Adding Integers Using a Money Analogy
One of the Most Beautiful Equations: Euler's Identity
https://youtube.com/shorts/p5UkPlMiGqEMake Equations True with Parentheses and Arithmetic Operations: Twos (Part 1)
Make Equations True with Parentheses and Arithmetic Operations: Twos (Part 2)
Make Equations True with Parentheses and Arithmetic Operations: Threes (Part 1)
Make Equations True with Parentheses and Arithmetic Operations: Threes (Part 2)
Make Equations True with Parentheses and Arithmetic Operations: Fours (Part 1)
Make Equations True with Parentheses and Arithmetic Operations: Fours (Part 2)
Make Equations True with Parentheses and Arithmetic Operations: Fives (Part 1)
Make Equations True with Parentheses and Arithmetic Operations: Fives (Part 2)
Make Equations True with Parentheses and Arithmetic Operations: Sixes (Part 1)
Make Equations True with Parentheses and Arithmetic Operations: Sixes (Part 2)
Make Equations True with Parentheses and Arithmetic Operations: Sevens (Part 1)
Make Equations True with Parentheses and Arithmetic Operations: Sevens (Part 2)
Make Equations True with Parentheses and Arithmetic Operations: Eights (Part 1)
Make Equations True with Parentheses and Arithmetic Operations: Eights (Part 2)
Make Equations True with Parentheses and Arithmetic Operations: Nines (Part 1)
Make Equations True with Parentheses and Arithmetic Operations: Nines (Part 2)
Determine Which Exponential Term is Greater: 5^22 or 3^33
The Butterfly Method to Subtract Fractions
Simplify Fractions Using the TI-84: Two Methods
ACT/SAT Math Prep: Determine the Price of a Phone Given Information
ACT/SAT Math Prep: Proportion with Mixed Numbers
Equation Challenge: Solve an Equations with a Complex Fraction
ACT/SAT Math Prep: Given the Sum and Ratio of Two Unknown Numbers, Find Their Product
Arithmetic Challenge: Make an Equation Try Using Addition, Subtraction, Multiplication and Division
The Butterfly Method to Add Fractions
ACT/SAT: Properties of Exponents Challenge
Alternative Method to Multiply When Multiplying by Nines
Number Pattern When Multiplying with 19
ACT/SAT Math: Determine the Ones Place Value of 4 raised to a Large Power
Pattern Challenge: Redefining Addition (Part 1)
Pattern Challenge: Redefining Addition (Part 2)
https://youtube.com/shorts/3hf35_hhnO8https://youtube.com/shorts/FU-S6PyN0bsHow Big is One Million? Numerical Approach
How Big is One Million? Time, Area, Volume
How Big is One Million? Distance and Money
Connect 9 Points Challenge
Make a 3D Design On Desmos Using Functions with Domain Restriction and Transformations
Equation Challenge: Solve an Equation Using Exponent Properties
Curious Calculation #1: The Answer is Always 3?
Curious Calculation #2: The Answer is Always 8?
Curious Calculation #3: The Answer is Always 37?
What is a Googol?
Where is the Missing Dollar?
If a Stock does Down 10% and Then Up 10%. Is it Up, Down, or Unchanged in Value?
If a Stock does Loses 10%, What Gain is Needed to Recover?
ACT/SAT Math: Simplify a Quotient of Radicals Using Rational Exponents
Easily Compare Two Fractions Using Cross Multiplication
ACT/SAT Math: Find the Sum of Coefficients of a Quadratic Function Given f(0) and f(1)
Equation Challenge: Solve 5^(log x)=x Using Logarithms
Arithmetic Challenge: Reposition One Stick to Make an Equation True
Another Way of Showing a^0 = 1
Curious Calculation: The Answer is Always 73!?
Equations Challenge: Solve x^2=2^x
Find the Value of an Expression Given a System of Equations
Logarithmic Equation Challenge
Quotient Challenge: What is 4/50%?
Subtracting without Exchanges with a Minuend with 0's
Why is x^0=1?
Can You Make Exactly 4 Gallons of Water From a 3 Gallon and 5 Gallon Container
Which Fraction is Closest to 1/2?
Equations Challenge: Solve x^(1/2) = x^(1/4)
Equivalent Expressions? log_2(4^3) and log_2(4)^3
Plotting Points on the Coordinate Plane
What is 50% Divided by 1/2?
Use Eight 8's and Addition to Make 1000
Evaluate 5 Plus 20 Divided by 1/2
Name That Math Formula
Are the Three Fractions Different?
Challenge: Find the Next Term in the Sequence
18th Century Riddle: Find Your Son's Age
18th Century Riddle: What Time Is It?
Frog Jump Challenge
Pi Product Notation
Math Challenge: Powers of 2 Equation
Reversing Percent Problems
Rounding to the Nearest Tenth
Rounding to the Nearest Whole Number (Ones)
Rounding to the Nearest Tens
Sigma (Summation) Notation
Stick Multiplication
Arithmetic Challenge: 8 Divided by 1/2 Multiple times
Equation Challenge: (sqrt(x))^x = x^(sqrt(x))
Equation Challenge: 8^2+4^3=8^(2x)
Equation Challenge: 2^10+2^10=2^x
Equation Challenge: 2^(5x)=sqrt(2)
What Does It Mean To Divide By a Fraction?
Negative Exponent Review
Arithmetic Challenge: 1/2 Divided by 1/2 Multiple Times
What is 500% Divided by 50%?
Negative Exponent Challenge: 10^(-3)+10^(-2)
ACT/SAT Math: What is 8^16+8^16+8^16+8^16?
Can This Equation Be True? 8 + 8 = 91
Complete the Square to Solve a Quadratic Equation
Math Challenge: Simplify a Quotient of Complex Numbers to a Power
Equation Challenge: Solve 2*3^9-k*3^8=4*3^8
Which is Larger? 3^75 or 2^100
Can You Simplify a Rational Expression As Much As Possible?
What is the Price In Terms of X After Two Discounts?
Solve a Quadratic Equation Using the Quadratic Formula
Math Challenge: Given (x+y)/(x-y)=9, Determine x/y.
Rational Equation Challenge: Can You Solve the Given Rational Equation?
Math Challenge: Simplify 2^22 * 3^33.
Common Errors When Simplifying Rational Expressions
Math Challenge: Given the Sum and Ratio of Two Numbers, Determine the Product of the Two Numbers
Math Challenge: If x^10 = 5 and x^9/y=5555, Determine 1/(xy)
Why a +/- When Solving x^2 = a?
Do You Know the World Population?
Do you Know the Derivatives of the Trigonometric Functions?
Do you Remember the Basic Logarithmic Properties?
Review: Power Rule of Differentiation (Part 1)
Review: Power Rule of Differentiation (Part 2)
Simplifying Square Roots: Common Errors
Do You Know the Top 5 Most Populated Countries?
Equation Challenge: Find the Value of an Expression Given an Equation
New! Desmos Now Has a 3D Graphing Calculator!
Factor a Difference of Cubes
Factor a Sum of Cubes
Can You Find the Differences of the Imaginary Numbers? (Simplify First)
Find the Percent of a Percent of a Number
Answering the Three Types of Percent Problems Using a Percent Equation
Estimate the Value of a Square Root (Ex 1)
Estimate the Value of a Square Root (Ex 2)
How Much Sooner Can You Pay off A Loan By Paying More? (TVM Solver)
Know Your Car Payment Before Shopping for a Car (TVM Solver)
Know What Car Price To Look For From The Monthly Payment You Can Afford (TVM Solver)
Fractions to Positive Powers
A Fraction to the Power of Negative One: (3/5)^(-1)
A Fraction to the Power of Negative Two: (5/8)^(-2)
A Fraction to the Power of One-Half: (4/25)^(1/2)
A Fraction to the Power of Two-Thirds: (8/27)^(2/3)
A Fraction to the Power of Negative One-Half: (9/16)^(-1/2)
A Fraction to the Power of Negative Two-Thirds: (27/125)^(-2/3)
Determine a Max Loan Amount from a Monthly Payment Using a Formula
Determine How Much Money Needed For Retirement Using a Formula
Savings Annuity: Compare $100/Month for 30 Years to $200/Month for 15 Years
What is 6+6+6+6*0?
Finding Trigonometric Function Values using a 45-45-90 Reference Triangle
Finding Trigonometric Function Values using a 30-60-90 Reference Triangle
Commonly Missed Work Problem: How Long to Complete a Job When Working Together?
Math Challenge: Simplify the Square Root of a Sum (Cambridge Interview Question)
What is the Square Root of x^2?
Geometry: Find Missing Lengths and Area Using Area Decomposition
Convert Decimals Less Than One To Fractions
Convert Decimals More Than One To Fractions
Product Rule of Differentiation Without The Chain Rule
Product Rule of Differentiation With The Chain Rule
Equation Challenge: Find All of the Solutions to x^4=16
381,654,729 is a Special Number!
3,816,547,290 is a Special Number!
Which is Larger? Square Root of 2 or Cube Root of 3
Most People Miss this Math Problem: Cost of Ball and Bat
Suprising Math Fact: The Difference of Consecutive Squares
Suprising Math Fact: The Difference of Consecutive Squares Proof
The Power Rule of Differentiation Review
The Power Rule of Differentiation Review: A Square Root Function
The Power Rule of Differentiation Review: A Cube Root Function
Differentiation of an Exponential Function (Base e) with the Chain Rule
Differentiation of an Exponential Function (Not Base e) with the Chain Rule
Differentiation of an Natural Logarithmic Function (Base e) with the Chain Rule
Differentiation of an Logarithmic Function (Not Base e) with the Chain Rule
Does 1 = 0.9999…? (Fractions)
Does 1 = 0.9999…? (Equations)
Does 1 = 0.9999…? (Infinite Series)
Divisibility Rule for 7
Common Divisibility Rules
How to Determine the Prime Factorization of a Number
An Interesting Math Pattern Involving the Number 9
Derivatives Using the Chain Rule Involving Sine
If I Pay More on a Car Loan, How Early Can I Pay off the Loan? (TVM Solver)
If I Pay More on a Home Mortgage, How Early Can I Pay off the Loan? (TVM Solver)
Logarithmic Challenge: Does Log_4(x)=1/2Log_2(x)?
What is Special About Numbers with an Odd Number of Factors?
The Vertical Line Test: Determine if a Graph Represents a Function
The Horizontal Line Test: Determine if a Function is One-to-One
Simplifying Fractions: Dividing Out Common Factors
Simplifying Fractions Using Prime Factorization
Definition of an Inverse Function
Find an Inverse Function Value Given a Function Rule
Find an Inverse Function Value Given a Linear Function
Common Simplifying Error: -4^2/2
Find the Vertex of a Quadratic Function in Standard Form
Vertex Form of a Quadratic Function: Find Vertex and Axis of Symmetry
Quadratic Function: Standard Form to Vertex Form (a=1)
Quadratid Function: Standard Form to Vertex Form (a not 1)
Arithmetic Challenge: Simplify sqrt(1/16)+150% to a Fraction
Arithmetic Challenge: Simplify sqrt(1/16)+150% to a Decimal
Arithmetic Challenge: Simplify the Square Root of a Sum