[Free Registration/Login may be required to access all resource tools.] This is a set of practice problems where students solve addition and subtraction problems in order to determine missing numbers to keep the equation balanced. When...

[Free Registration/Login may be required to access all resource tools.] The resource includes a video tutorial on how to find a missing number in a multi-operational problem by working backwards. The video is followed by practice...

Based off of the hit television show NUMB3RS, this lesson shows students how using matrix multiplication can lead to solving real-world problems. In this situation, a painting is missing and the probability of travel betweek five cities...

The famous Clockenheimer Cuckoo is missing from Clockenheimer Clocks on Main Street! Help Math Maven get it back by solving a math riddle.

Help Math Maven solve this mystery! Items are missing from several hotel rooms, but some addition and subtraction clues have been left behind. Use your skills to figure out where the thief will strike next!

An extensive collection of teacher resources to help in teaching and reviewing the concepts of basic addition and subtraction. There are many worksheets, activities, PowerPoint presentations, smartboard activities, Word, Excel, and pdf...

This App allows students to review how to perform algorithms for the four basic operations. The three modes - the step-by-step mode, fast mode, and the Missing Pieces game allows students to learn, review, and understand the concepts for...

This App helps students develop mental math skills through structured play activities. Students progress from simply filling in missing values to actually finding both a number and an operation to make a true sentence.

The astronaut crew had to troubleshoot a series of problems throughout the historic 1969 flight. This historic exchange on July 20, 1969 marked the end of a perilous journey to the lunar surface, but a multitude of threats still faced...

Use this interactive math crossword puzzle to build number sense skills. Simply fill in the missing numbers based on the operation. Immediate feedback given to responses.

This site focuses on the author Albert Webster including links to the full text of his short stories: "Miss Eunice's Glove" and "An Operation in Money".

This App helps students build number sense skills and gain confidence at math by hand. Review how to perform algorithms for the four basic operations (Addition, Subtraction, Multiplication, and Division). A step-by-step mode emphasizes...

Don't miss the chart that shows the many political parties that operate in the small country of Benin. Read about its government and its recent elections. Information is from the CIA World Fact Book and the U.S. State Dept. Background...

This website is dedicated to the U.S. Senate Committee on Rules and Administration. The purpose of this committee is to oversee the legislative body and make sure they are operating fairly. Don't miss out on this comprehensive site.

This website explains and defines basic subtraction. There are practice problems at the very end of this lesson.

This interactive site provides students an opportunity to practice their multiplication skills by helping organize and count musical instruments.

The ratio calculator performs three types of operations and shows the steps to solve. It simplifies ratios or creates an equivalent ratio when one side of the ratio is empty, solves ratios for the one missing value when comparing ratios...

MathWorld provides a detailed definition of addition.

General McPherson, born in Sandusky, Ohio, November 14th, 1828, died near Atlanta, Ga., July 22nd, 1864; was graduated at the United States Military Academy in 1853. At the beginning of the Civil War he applied for active duty with the...