Need some help figuring out how to the rationalize denominators in prealgebra? 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 study for that next big test).
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How To: Find the Percent Given Two Numbers

How To: Find a number given Its percent

How To: Calculate Faster Than a Calculator

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

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

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

How To: Find the area & perimeter of triangles & squares

How To: Derive the area of a circle

How To: Do long division without a calculator

How To: Find the area of a circle when you know the diameter

How To: Find Leg Lengths and Hypotenuse of a 45 45 90 Triangle

How To: Find the area of a parallelogram using geometry

How To: Find the slope of a line given 2 points with fractions

How To: Find the area of irregular shapes

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

How To: Convert fractions to percents in two steps

How To: Do normal probability calculations on a calculator

How To: Find the interior & exterior angles of a triangle

How To: Solve word problems containing radical equations

How To: Understand fractions with patterns
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