Practice your arithmetic skills as you estimate the answer to questions involving addition, subtraction, multiplication, and division. Includes whole numbers, fractions, and percents. As you answer questions, you guide penguins across an...

Use this GPA calculator to find your GPA using the standard 4.0 GPA scale or a weighted scale for Honors and AP courses. Input the course name, the number of course credits and your grade for the term.

Explains and demonstrates how to calculate the percentage increase from year to year and how to calculate it using an Excel spreadsheet.

In these interactive visualizations, explore the relationship between calculating miles per gallon (mpg) to gallons per mile in fuel use for vehicles. Most drivers think gas usage falls linearly (in a straight line) as mpg increases. But...

In this interactive, students use logic and mathematical skill to place animals at the correct points on a Cartesian graph representing the cardinal directions. Then, they use the Pythagorean theorem to determine the distances between...

Use this calculator to calculate cubic yards volume for a variety of different areas. Enter measurements in US units or metric units. Calculate volume from your measurements in inches (in), feet (ft), yards (yd), centimeters (cm), or...

Calculate speed, distance, or time using the formula d = st, distance equals speed times time. The Speed Distance Time Calculator can solve for the unknown sdt value given two known values

Multiplication of positive or negative whole numbers or decimal numbers as the multiplicand and multiplier to calculate the product using long multiplication. The solution shows the work for the Standard Algorithm.

In this volume calculator, conversions are performed by using a conversion factor. By knowing the conversion factor, converting between units can become a simple multiplication problem.

Learn about the relationship between vapor pressure of water and capacity of air to hold water vapor, the relationship between relative humidity and partial pressure of water vapor in the air, and how to calculate vapor density,...

Explanation of linear equations and four types of slopes: positive, negative, zero, and undefined. Practice problems for the students are provided and a reinforcement activity using a graphing calculator is offered for the teacher's use.

By the end of this section, you will be able to explain gravitational potential energy in terms of work done against gravity, show that the gravitational potential energy of an object of mass m at height h on Earth is given by PEg = mgh,...

The free mathematics software creates interactive learning material that combines geometry, graphing, tables, algebra, statistics, and calculus. Teachers can download the free open source software to enhance their mathematics lessons. A...

Solve for an unknown value x with this fractions calculator. Find the missing fraction variable in the proportion using cross multiplication to calculate the unknown variable x. Solve the proportion between 2 fractions and calculate the...

By the end of this section, you will be able to explain the human body's consumption of energy when at rest versus when engaged in activities that do useful work and to calculate the conversion of chemical energy in food into useful work.

Sixth graders work with a ratio stating the number of boys to girls in a school and use it to calculate the fraction of students who are boys and the total number of students. Aligns with 6.RP.A.

The purpose of this task is to use similar triangles and setting up a proportion in order to calculate a side length. Aligns with G-SRT.B.5.

Explains, with examples, what compound interest is and how to calculate it using a formula. Also shows how to work backwards to calculate the present value of an investment, how compound interest is calculated for different compounding...

By the end of this section, you will be able to explain the relationship between vapor pressure of water and the capacity of air to hold water vapor, explain the relationship between relative humidity and partial pressure of water vapor...

Reversible reactions, equilibrium, and the equilibrium constant K. Learn how to calculate K, and how to use K to determine if a reaction strongly favors products or reactants at equilibrium.

Article reviews some probability basics then investigates how these calculations can be applied to genetics problems involving relatively large numbers of genes. Explores how the sum rule and the product rule can be used to solve these...

Understand the difference between laminar and turbulent flow and what fluid viscosity is by studying this section of a College Physics textbook. Section includes how to use Poiseuille's law to calculate fluid flow in a tube. Section also...

In this section of a college textbook, the topic of radiation is explored. Understand how the process of radiation transfers heat. Also learn how to calculate the rate of heat transfer by using the Stefan-Boltzmann law of radiation....

By the end of this section, you will be able to describe the use of heat engines in heat pumps and refrigerators, demonstrate how a heat pump works to warm an interior space, explain the differences between heat pumps and refrigerators,...