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More on equivalent fractions | Fractions | 4th grade | Khan Academy
By Khan Academy
Important: if you multiply a fraction's numerator and the denominator by the same number, you'll end up with an equivalent fraction. Got it? Maybe? No problem, we'll help!
Whole number exponents with integer bases 2
By Khan Academy
Apply what we know about negative numbers to determine how negative bases with exponents are affected and what patterns develop. Also learn how order of operations affect the pattern.
DEPRECATED Dividing polynomials by binomials 3
By Khan Academy
Sal explains what it means to simplify a rational expression and why we would want to do that. Just don't forget the excluded values!
Factor polynomials with special product forms
By Khan Academy
Sal factors 49x^2-49y^2 as (7x+7y)(7x-7y) or as 49(x+y)(x-y).
Equivalent forms of exponential expressions
By Khan Academy
Sal simplifies the expression 10*9^(0.5t+2)*5^(3t) as 810*375^t.
Factor quadratics with a leading coefficient of 1
By Khan Academy
Sal factors x^2-14x+40 as (x-4)(x-1) and x^2-x-12 as (x+3)(x-4).
Factor quadratics with a leading coefficient of 1
By Khan Academy
Can't get enough of Sal factoring simple quadratics? Here's a handful of examples just for you!
Groups of ten objects
By Khan Academy
Learn why we use a ones place and a tens place when writing numbers. This video uses the number 37 as an example.
Rectangle area as product of dimensions same as counting unit squares
By Khan Academy
Use unit squares to see why multiplying side-lengths can also find the area of rectangles. ������������������������
