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Subtracting mixed numbers: 7 6/9 - 3 2/5
Sal subtracts 3 2/5 from 7 6/9 by rewriting each mixed number to have a common denominator.
Adding mixed numbers: 19 3/18 + 18 2/3
Sal adds 19 3/18 + 18 2/3 by rewriting each mixed number to have a common denominator.
Subtracting fractions with unlike denominators
Sal subtracts fractions like 4/3 and 1/5.
Subtracting mixed numbers with regrouping (unlike denominators)
Sal subtracts 17 4/9 - 12 2/3.
Adding mixed numbers with regrouping
Sal adds 2 2/3 + 8 3/4.
Adding fractions with unlike denominators
Sal adds fractions like 3/4 and 1/5.
Counting in order
Learn how to count without making mistakes.
Khan Academy
Counting small numbers
452
01:57
Finding probablity example 2
In this example we are figuring out the probability of randomly picking a non-blue marble from a bag. Again, we'll have to think about the possible outcomes first.
Khan Academy
Basic probability
941
09:55
Finding probablity example
In order to find the probability of picking a yellow marble from a bag, we have to first determine the number of possible outcomes and how then many of them meet our constraints.
Khan Academy
Basic probability
784
02:55
Finding probablity example 3
Now we're working out the probability of randomly selecting a yellow marble from a bag of multi-colored marbles. Let's practice together.
Khan Academy
Basic probability
759
02:10
Counting with small numbers
Learn how to count squirrels and horses.
Khan Academy
Counting small numbers
824
00:55
Systems with Elimination Practice
Example of solving systems of equations with elimination
Simple Elimination Practice
Practice solving systems of equations through simple elimination (exercise at http://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/e/systems_of_equations_with_elimination_0.5 )
Example 3: Solving systems by elimination
Solving systems by elimination 3
Addition Elimination Method 4
Addition Elimination Method 4
Addition Elimination Method 3
Addition Elimination Method 3
Addition Elimination Method 2
Addition Elimination Method 2
