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 involving a mixture of two or more substances.
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How To: Remember "greater than" & "less than" symbols

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How To: Find the area of an oblique triangle using formulas

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How To: Calculate percent composition for chemistry

How To: Find a number given Its percent

How To: Do long division without a calculator

How To: Find the standard deviation with the ZScore formula

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

How To: Calculate the area of a parallelogram

How To: Convert between diameter and radius

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

How To: Solve for the missing ratios or proportions

How To: Find how many toothpicks will be needed to form the nth figure in a sequence

How To: Convert improper fractions to mixed numbers quickly

How To: Subtract fractions with borrowing

How To: Learn Calculus in 20 minutes

How To: Solve problems involving deductive reasoning

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

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

How To: Calculate Faster Than a Calculator

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

How To: Find the area of an oblique triangle using formulas

How To: Find the Percent Given Two Numbers

How To: Calculate percent composition for chemistry

How To: Find a number given Its percent

How To: Do long division without a calculator

How To: Find the standard deviation with the ZScore formula

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

How To: Calculate the area of a parallelogram

How To: Convert between diameter and radius

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

How To: Solve for the missing ratios or proportions

How To: Find how many toothpicks will be needed to form the nth figure in a sequence

How To: Convert improper fractions to mixed numbers quickly

How To: Subtract fractions with borrowing

How To: Learn Calculus in 20 minutes

How To: Solve problems involving deductive reasoning
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