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 use rounding to estimate sums.
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How To: Remember "greater than" & "less than" symbols

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

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

How To: Calculate Faster Than a Calculator

How To: Do long division without a calculator

How To: Calculate percent composition for chemistry

How To: Find the Percent Given Two Numbers

How To: Calculate the area of a parallelogram

How To: Calculate the height and volume of a pyramid

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

How To: Find the area of a triangle when given 2 sides & angle

How To: Evaluate factorials with a TI83 calculator

How To: Find the polar form of a complex number

How To: Find the Height of a Trapezoid.

How To: Convert improper fractions to mixed numbers quickly

How To: Subtract a mixed number from a proper fraction in basic math

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

How To: Solve advanced ratio problems in algebra

How To: Do normal probability calculations on a calculator

How To: Do long division with decimals
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