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 unpack and solve word problems that require you to subtract one decimal from another.
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How To: Calculate the area of a parallelogram

How To: Derive the area of a circle

How To: Use the Chain Rule for finding derivatives

How To: Find the Percent Given Two Numbers

How To: Do long division without a calculator

How To: Find the equation of a circle given: center & tangent

How To: Solve problems involving functions in algebra

How To: Identify characteristics of a sample during a survey

How To: Find the area of irregular shapes

How To: Apply the fundamental rule of proportions

How To: Subtract fractions with borrowing

How To: Subtract mixed numbers with borrowing

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

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

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

How To: Divide larger numbers and do long division

How To: Calculate Faster Than a Calculator

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

How To: Find patterns in arithmetic sequences

How To: Find a number given Its percent

How To: Calculate the area of a parallelogram

How To: Derive the area of a circle

How To: Use the Chain Rule for finding derivatives

How To: Find the Percent Given Two Numbers

How To: Do long division without a calculator

How To: Find the equation of a circle given: center & tangent

How To: Solve problems involving functions in algebra

How To: Identify characteristics of a sample during a survey

How To: Find the area of irregular shapes

How To: Apply the fundamental rule of proportions

How To: Subtract fractions with borrowing

How To: Subtract mixed numbers with borrowing
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