From Ramanujan to calculus cocreator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to find answers to rational equation problems in algebra.
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How To: Calculate percent composition for chemistry

How To: Remember "greater than" & "less than" symbols

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Find a number given Its percent

How To: Find standard deviation

How To: Convert Fahrenheit to Celsius with a formula

How To: Find the area of rectangles, triangles & rectangles

How To: Calculate the area of a parallelogram

How To: Do long division without a calculator

How To: Find the Volume of Composite Figures (Also Called Composite Shapes)

How To: Identify characteristics of a sample during a survey

How To: Find the Slope Given 2 Ordered Pairs

How To: Use a TI89 to calculate nCr

How To: Find the equation of a circle given: center & tangent

How To: Find the area of an oblique triangle using formulas

How To: Write a slopeintercept equation given an XY table

How To: Find a missing side of a triangle, similar to another

How To: Calculate the area of complex shapes

How To: Solve word problems involving the addition of whole numbers

How To: Evaluate exponents
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