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 word problems requiring use of the identity property of 1.
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How To: Remember "greater than" & "less than" symbols

How To: Do long division without a calculator

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

How To: Find the area of a parallelogram using geometry

How To: Calculate the area of a parallelogram

How To: Simplify surds (improper square roots)

How To: Calculate Faster Than a Calculator

How To: Find the Percent Given Two Numbers

How To: Find the slope from a set of points

How To: Find a missing angle outside of a triangle

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

How To: Normalize a data set into another scale

How To: Find a number given Its percent

How To: Calculate percent composition for chemistry

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

How To: Evaluate fractions containing variables

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

How To: Convert fractions to percents in two steps

How To: Simplify fourth roots

How To: Use a mean and scatter plot for Statistics
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