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Age word problems
By Khan Academy
Sal solves the following age word problem:������������William is 4 times as old as Ben. 12 years ago, William was 7 times as old as Ben. How old is Ben now?
Add and subtract polynomials with two variables
By Khan Academy
Sal simplifies (4x^2y - 3x^2 - 2y) + (8xy - 3x^2 + 2x^2y + 4).
Simplify numerical radical expressions with multiple terms
By Khan Academy
Sal shows how to rationalize the denominator of the expression (16+2x^2)/(8).
Comparing decimal place value
By Khan Academy
We're having a blast with decimals! Check this one: we're comparing place values. This will blow your mind.
Combining like terms with distribution and negative numbers
By Khan Academy
We've learned about order of operations and combining like terms. Let's layer the distributive property on top of this.
Comparing linear functions word problems
By Khan Academy
Sal is given a table of values that represents four people walking to school, and is asked to determine which one started out farther from the school.
Decompose figures to find volume
By Khan Academy
Find the volume of an irregular 3D figure made up a unit cubes by dividing the figure into two rectangular prisms and finding the volume of each part.