Codebymath.com - Online coding lessons that teach you about math.

There's a lot here. If you login we'll track your progress.

New! Coding lessons about Chance and Probability.

Start here

Displaying text

Speaking text

Displaying nice looking math

How programs flow

Programming as a calculator

Dividing by zero

Testing divisibility

Literal vs. to-be text

Using absolute values

Using Pi on the computer

Using square roots

Random numbers

Reading text from the keyboard

Getting clicks from the mouse

Square roots and the distance formula

Square roots and the Pythagorean Theorem

Finding Pythagorean Triples

Algebra vs. computer

Simple Graphics and Drawing

Drawing pixels

Choose a plotting color

The Cartesian Coordinate System

Zoom in or out

Make the computer talk

Speaking text

Speaking text with different voices

Speaking text at different speeds

Speaking numbers properly

Variables in programming

Introduction

Mathematical expressions with variables

Calculate a tip

Calculate a tip (with keyboard input)

Distance formula with variables

Changing a variable in one line

Rescaling a result

Drawing lines with the mouse

Drawing circles with the mouse

The slope of a line

The for-loop: counting over a range of numbers

Using for-loops to count

More for-loop counting

Make math practice problems

Making math-facts tables

Study the absolute value

Adding numbers like Carl Gauss did

Adding numbers to find Pi

Finding square roots

Iterating a function

Interating the logistic function

Iterate for a square-root

A clever for-loop for Pi

An even more clever for-loop for Pi

What kinds of numbers?

Diverging and converging series

Numbers ending in 1

The for-loops: making graphs

Make it snow

Graph a line in slope-intercept form

Graph the absolute value

Graph a parabola

Graph a function

The Lorenz Attractor

The for-loops: Simple computer animation

Animate a single pixel

Animate a more complex shape

Animate with laws of physics

The if-statement: Asking true or false questions

Introduction

True/false with variables

Compound true/false questions

The if-statement

Divisibility tester (1)

Divisibilty tester (2)

Checking random numbers

Graphing inequalities (x-axis)

Graphing inequalities (xy-plane)

Graphing systems of inequalities

Throwing darts to find Pi

Solving Quadratic Equations

The Pythagorean Theorem Calculator

Fermat's Last Theorem

Divisibility of numbers $<1000$

Functions in programming

Introduction

Returning values

Convert between Celsius and Fahrenheit

Finding the Greatest Common Divisor (GCD)

Reducing fractions with the GCD

A better GCD calculator

Least common multiple (LCM)

Finding common denominators using the LCM

Add fractions and reduce answer to lowest terms

Is a number prime?

The Fibonacci Sequence

The Factorial

Computing Pi using factorials

Testing the derivative

Doing integrals numerically

Using sine and cosine

Test the famous sin/cos identity

Test the sin/cos identity graphically

Make cool polar plots

Coaxing Pi from the computer

Rotate a parabola

Find sin(x) by adding numbers

Strings of text

Introduction

The length of a string

Comparing strings

Comparing strings (2)

Finding Palindromes

Palindromic squares

Patterns in Pi ($\pi$)

Patterns in Pi ($\pi$) (more)

The while-loop

I'll guess your number

Solving equations

$\sqrt{n}-\sqrt{n-1}<0.01$

Arrays

Introduction

Loops and arrays

Arrays and averaging numbers

Arrays and recurrence relations

Arrays and histograms

Histogram Pi's digits

Histogramming uniform rnd nums

Normally distributed rnd nums

Cellular Automatum

Birthday Surprise

Symbolic math: Doing algebra on the computer

Introduction: combining exponents

Multiplying a polynomial by a monomial

Raising polynomials to some power

Simplify an algebraic expression

Factor a polynomial

Solve equations

Take a derivative

Code with Google Charts

Make a Chart

Make an (x,y) plot

Introduction to Data Science: Working with data and files

Introduction to data files

Reading data from a file

Reading all data from a file (1)

Reading all data from a file (2)

Testing for the end of file (EOF)

Find the total of some numbers

Find the average of some numbers

Find the maximum value

Find the minimum value

Confusion with max and min

Visualize data with a plot

Dealing with two column data files

Dealing with a line of CSVs

Graph a CSV file of CO2 concentration

Some challenges with CO2 concentration

Mining geographic data

Work with student grades

Trendlines and dealing with a list of numbers

Guess your own trendline

Compute the best possible trendline

Compute the r-value for a trendline

A list of numbers: the max, min, and average

A list of numbers: Make a histogram (Part 1)

A list of numbers: Make a histogram (Part 2)

A list of numbers: Plot the histogram (Part 3)

A list of numbers: Testing the standard deviation

Learning about probability using coins and dice

Rolling a die until a 6 comes up

The dice game of Craps

Picking blue, white, and red balls

Rolling a dice, twice

Not rolling a 7 or 11

Code to make an animated-GIF

Introduction: Make a flashing animation

Make a point move

Make a line move

Make a circle move

Make complex objects move

Functions make it easier

Code with Google Maps

Code with 3D Graphics

Introduction to 3D graphics

Depth with 3D graphics

3D graphics and the camera

3D graphics and the light source

Drawing in 3D with cubes

Drawing lines in 3D

Drawing polylines in 3D

Code with Sound

Code for your 3D Printer

Make a 3D-printable XY-graph

221 total lessons.