Teachnology
Teachnology: Math Lesson Plans
Great lesson plans covering a wide-range of math-related subjects.
Oswego City School District
Regents Exam Prep Center: Solving Systems Using Addition or Subtraction
Three examples are used to demonstrate solving a system of linear equations algebraically using addition and subtraction. The examples cover different situations that occur with the coefficients of the variable terms. Includes several...
Math.com
Computer Romanus: Roman Numeral Calculator
This site has a calculator that uses only Roman Numerals! There is also an explanation of the number symbols for reference.
PBS
Pbs: The Lowdown: The Math of Credit Cards
Explore how credit cards work in this video from KQED. In particular, you'll discover the impact and high cost of outstanding balances when borrowing money using credit cards. In the accompanying classroom activity, students discuss the...
Better Lesson
Better Lesson: Using Area as an Architect (Stations Day 1)
In this multi-day activity, 3rd graders make 3 different models of an orphanage floor plan using Google Drawing, Virtual Graph paper, and a construction of rectilinear shapes, to calculate the area of each room using units square.
CK-12 Foundation
Ck 12: Algebra: Solving Linear Systems Using Matrices and Technology
[Free Registration/Login may be required to access all resource tools.] This lesson covers using a graphing calculator and matrices to solve a system of equations.
Alabama Learning Exchange
Alex: Wildlife Math
This integrated lesson is the result of collaboration between Chip Blanton, a wildlife management teacher, and Greg Pendergrass, a math teacher (Ft. Payne High School). Learning to manage wildlife requires an understanding of planting...
Math Open Reference
Math Open Reference: Surface Area of a Pyramid
Use this interactive tool to find the surface area of a pyramid. Try different figures for the height and the base to see how these affect the area. Properties of a pyramid are discussed, how to use a formula to calculate the surface...
Math Open Reference
Math Open Reference: Cone
Use this interactive tool to explore cones. Change the height and the radius to see how these affect the cone. There is also the option of making an oblique cone. Properties of a cone are discussed, how to use formulas to calculate the...
Calculator Soup
Calculator Soup: Golden Ratio Calculator
Use this calculator to find values that satisfy the golden ratio where (A+B):A = A:B. Enter any ratio term to calculate the missing golden ratio values. The answer also includes two additional, equivalent sets of golden ratio terms based...
Calculator Soup
Calculator Soup: Scientific Notation Calculator
Use this calculator to add, subtract, multiply and divide numbers in scientific notation, E notation, or engineering notation. Answers are provided in three formats: scientific notation, E notation, and engineering notation.
Wyzant
Wyzant: Simplifying Using the Distributive Property
Students investigate how to simplify using the distributive property. The resource consists of lessons with examples, an expression simplifying calculator, and a worksheet to check for comprehension.
Texas Education Agency
Texas Gateway: Solving Linear Equations and Inequalities
When given a table, equation or verbal description, students will solve one- and two-variable equations and inequalities using algebraic steps or graphing methods.
Shodor Education Foundation
Shodor Interactivate: Triangle Explorer
This applet allows users to study the nature of triangles and their area. It draws random triangles on a Cartesian coordinate system. The user can determine the area of the triangle using his or her preferred method. After the calculated...
Better Lesson
Better Lesson: Rewriting Formulas
For this lesson, young scholars explore "real-life" resources that make use of literal equations (rewriting known formulas) to help make people's lives easier. Students will use Excel to design formulas that find a specific value like...
CPALMS
Cpalms: Exploring Cavalieri's Principle
[Free Registration/Login Required] In this lesson, students use the geometry program GeoGebra to explore Cavalieri's Principle, specifically to investigate whether it applies when calculating the volume of oblique solids. Lesson includes...
CPALMS
Cpalms: Building Graduation Caps
[Free Registration/Login Required] In this lesson, students build geometric models of graduation caps using stiff paper. The activity requires the application of skills in finding surface area, understanding similarity, knowing the...
Khan Academy
Khan Academy: Interquartile Range (Iqr)
Practice calculating the interquartile range from a set of data. Students are able to check their answers, view a solution, and watch a video or use a hint.
Wyzant
Wyzant: Simplifying Multiple Positive or Negative Signs
Students learn how to simplify multiple positive or negative signs. The resource consists of lessons with examples, a combining like terms calculator, an equation calculator, and a activity to check for comprehension.
Oswego City School District
Regents Exam Prep Center: Systems of Linear Inequalities
Solving a system of linear inequalities is shown to be as easy as solving a system of linear equations! An example is explained before students are given several problems to complete on their own. Complete explanations of these are...
Alabama Learning Exchange
Alex: Let's Go Shopping!
This lesson will give students practice with adding and subtracting money using a calculator. It will provide them an opportunity to determine savings using a store coupon, and determine the change they should recieve when making...
Illustrative Mathematics
Illustrative Mathematics: G Srt Finding the Area of an Equilateral Triangle
This task examines how to calculate the area of an equilateral triangle two ways: using triangle congruence and using trigonometric ratios. Aligns with G-CO.C.10 and G-SRT.C.
Illustrative Mathematics
Illustrative Mathematics: F Tf Equilateral Triangles and Trigonometric Functions
The purpose of this task is to apply knowledge about triangles to calculate the sine and cosine of 30 and 60 degrees. Aligns with HSF-TF.A.3.
PBS
Pbs: Determining Surface Area With Unit Blocks
Use your spatial reasoning skills to calculate the surface area when given a 3D figure. This video focuses on a right rectangular prism and shows you how unit blocks can help you visualize, then calculate the surface area. This video was...