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 a slope of a straight line with: Ax + By + C = 0

How To: Find a number given Its percent

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

How To: Convert between diameter and radius

How To: Calculate Faster Than a Calculator

How To: Do long division without a calculator

How To: Find the Height of a Trapezoid.

How To: Convert decimals into fractions

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

How To: Find the Percent Given Two Numbers

How To: Calculate percent composition for chemistry

How To: Calculate the area of a parallelogram

How To: Factor a trinomial with negative leading coefficient

How To: Solve for the missing ratios or proportions

How To: Find outliers using the Zscore method

How To: Estimate probabilities with the empirical rule

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

How To: Find the Radius of a Circle from Arc Length

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

How To: Find least common multiple in rational expressions

How To: Find a slope of a straight line with: Ax + By + C = 0

How To: Find a number given Its percent

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

How To: Convert between diameter and radius

How To: Calculate Faster Than a Calculator

How To: Do long division without a calculator

How To: Find the Height of a Trapezoid.

How To: Convert decimals into fractions

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

How To: Find the Percent Given Two Numbers

How To: Calculate percent composition for chemistry

How To: Calculate the area of a parallelogram

How To: Factor a trinomial with negative leading coefficient

How To: Solve for the missing ratios or proportions

How To: Find outliers using the Zscore method

How To: Estimate probabilities with the empirical rule

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

How To: Find the Radius of a Circle from Arc Length

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

How To: Find least common multiple in rational expressions
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