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

How To: Do long division without a calculator

How To: Find the Slope Given 2 Ordered Pairs

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

How To: Divide and give an answer as a fraction

How To: Find the Percent Given Two Numbers

How To: Calculate the area of a parallelogram

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

How To: Find the area of a parallelogram using geometry

How To: Write a logarithm as a sum or difference of logarithms

How To: Write a sum/difference of logarithms as a logarithm

How To: Evaluate factorials with a TI83 calculator

How To: Calculate Faster Than a Calculator

How To: Write a slopeintercept equation given an XY table

How To: Learn Calculus in 20 minutes

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

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