Need help with mental math in your classroom? This guide is full of tips, tricks, and examples to help the teacher encourage learners to use their brain instead of a calculator. Practice problems are included with reasons how...

The square root of five and five do not have the same value! How many times have you addressed this with math classes? A lesson gives an explanation of a square root and gives examples for simplifying square root...

Estimating the value of numbers is much harder than it sounds! Scholars compare and order the value of numbers presented in different forms including fractions, decimals, roots, integers, and pi. This builds on the previous lessons in...

How do you operate with numbers in scientific notation? The resource provides examples on how to divide and multiply with numbers written in scientific notation. The handout and video also cover the procedure for addition and subtraction...

You mean the square root of five and five don't have the same value? Learners estimate the value of irrational roots. As they practice estimating the value, they increase their understanding of roots. The lesson is the fourth in a series...

You can't evaluate an irrational root expression without a calculator—or can you? Scholars estimate the value of roots within an expression to approximate the value of the expression. Expressions include a mix of square roots and whole...

When guess and check gets old, it's time to start graphing! An instructive lesson explains how to solve a system of linear equations using graphing. Equations are in both slope-intercepts and standard form. 

Help learners understand that perimeter and circumference are one in the same. Learners apply their skills to determine the perimeter/circumference of triangles, rectangles, and circles. They then use the same strategy to find the...

You may be able to see patterns visually, but mathematics quantifies them. Here learners find correlation in scatterplots and write equations to represent that relationship. They fit a line to the data, find two points on the line, and...

How much rain can that cloud make? Through a simulation, the class estimates the amount of candy rain contained in different cup clouds. After probing the clouds using different methods, class members adjust their estimates. Participants...

Brush up on your math skills relating to estimating products then try some practice problems to test your understanding.

This is a question about the best way to estimate the answer to a division problem. The answer offers a basic definition of estimation, along with several methods and the positive and negative aspects of each.

Sometimes it is difficult to solve an equation exactly. But an approximate answer may be good enough!

This site from MathWorld.com give a formula for a two point trapezoidal approximation for the area under a curve.

Learn about linear approximations with this helpful reference tool. Provides a detailed definition and examples that enhance further explanation. Includes links to related topics.

This MathWorld site presents a modification of Simpson's Rule called Simpson'e 3/8 Rule.

This page gives a description of the Spearman Rank Correlation Coefficient, which is an approximation to the exact correlation coefficient, r. It is somewhat easier to compute than the exact correlation coefficient. Also provides links...

This site opens with a very brief description of pi with an approximation. There are links to related terms, everyday examples, challenging problems, more information, and the interactive check point involving pi located in the left-hand...

A brief definition of relative error plus links to pages on absolute error, error propagation, and percentage error.

Detailed site explaining differentials. This site has downloadable examples and papers on differentiation.

The site gives the Taylor and Maclaurin Series Approximation.

The lesson explores how to round numbers. Explanations and examples are included in the tutorial.