Real Numbers

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A helpful scientific calculator that runs in your web browser window.

Excellent site showing examples of algebra, trig, calculus, differential equations, and linear algebra.

Some worked example problems that point out many common errors students make when solving them.

express 21 1/4% as a fraction in simplest form

370000000 people watched the football champion ship on t.v how can this number be expressed in scientific notation

Jo paid $14 for his shirt. It was originally priced at $22. What percent discount did he recive? A. 63.64% B. 36.36% C. 57.14%

Gives a detailed explanation of how to use interval notation, followed by numerous examples, from very simple to quite complex.

This page describes the sets of numbers, natural, whole, integers, rational, irrational and real numbers. Gives examples and organizes the information well.

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