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 unpack and solve problems that require you to estimate differences by rounding.
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How To: Remember "greater than" & "less than" symbols

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

How To: Calculate Faster Than a Calculator

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

How To: Do long division without a calculator

How To: Divide small numbers by big numbers

How To: Find the formula of a piecewise function given a graph

How To: Find the volume of a sphere with radius r

How To: Sketch the graph of a piecewise function

How To: Find the Percent Given Two Numbers

How To: Find a number given Its percent

How To: Figure out the domain & range of a piecewise function

How To: Find the area of a parallelogram using geometry

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

How To: Spend Money on a Graphing Calculator? Nah—Just Use This WebBased TI Emulator

How To: Do long division with decimals

How To: Find the area of irregular shapes

How To: Solve equations involving square roots

How To: Normalize a data set into another scale

How To: Find density using the water displacement method

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

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

How To: Calculate Faster Than a Calculator

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

How To: Do long division without a calculator

How To: Divide small numbers by big numbers

How To: Find the formula of a piecewise function given a graph

How To: Find the volume of a sphere with radius r

How To: Sketch the graph of a piecewise function

How To: Find the Percent Given Two Numbers

How To: Find a number given Its percent

How To: Figure out the domain & range of a piecewise function

How To: Find the area of a parallelogram using geometry

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

How To: Spend Money on a Graphing Calculator? Nah—Just Use This WebBased TI Emulator

How To: Do long division with decimals

How To: Find the area of irregular shapes

How To: Solve equations involving square roots

How To: Normalize a data set into another scale

How To: Find density using the water displacement method
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