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. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to unpack and solve word problems that require you to subtract one decimal from another.
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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: Solve equations with the order of operations

How To: Divide small numbers by big numbers

How To: Do long division without a calculator

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

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

How To: Convert Fahrenheit to Celsius with a formula

How To: Find the Percent Given Two Numbers

How To: Calculate percent composition for chemistry

How To: Find the area of a parallelogram using geometry

How To: Determine the age of a fossil using carbon14

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: Prove a triangle inscribed in a circle is right angled

How To: Find extra points for a parabola (quadractic equation)

How To: Find the equation of a line given 1 point

How To: Write a slopeintercept equation given an XY table

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