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 requiring you to round whole numbers.
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How To: Find the Volume of Composite Figures (Also Called Composite Shapes)

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

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

How To: Do long division without a calculator

How To: Find the area of a parallelogram using geometry

How To: Determine the age of a fossil using carbon14

How To: Convert improper fractions to mixed numbers

How To: Calculate percent composition for chemistry

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

How To: Convert improper fractions to mixed numbers quickly

How To: Simplify Square and Cube Roots

How To: Convert mixed numbers to improper fractions

How To: Calculate Faster Than a Calculator

How To: Convert between diameter and radius

How To: Use a TI89 to calculate nCr

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

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

How To: Estimate probabilities with the empirical rule

How To: Calculate percentage

How To: Reduce and simplify fractions

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

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

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

How To: Do long division without a calculator

How To: Find the area of a parallelogram using geometry

How To: Determine the age of a fossil using carbon14

How To: Convert improper fractions to mixed numbers

How To: Calculate percent composition for chemistry

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

How To: Convert improper fractions to mixed numbers quickly

How To: Simplify Square and Cube Roots

How To: Convert mixed numbers to improper fractions

How To: Calculate Faster Than a Calculator

How To: Convert between diameter and radius

How To: Use a TI89 to calculate nCr

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

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

How To: Estimate probabilities with the empirical rule

How To: Calculate percentage

How To: Reduce and simplify fractions
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