Oldest

Basic Addition

Khan Academy
844
07:43

Basic Subtraction

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824
08:32

Adding Mixed Numbers

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1018
02:05

Adding Mixed Numbers with Unlike Denominators

Khan Academy
807
05:15

Adding Mixed Numbers Word Problem

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774
03:21

Subtracting Mixed Numbers

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885
03:58

Subtracting Mixed Numbers 2

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871
04:53

Multiplying Mixed Numbers

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1644
04:20

Dividing Mixed Numbers

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1044
02:40

Converting Repeating Decimals to Fractions 1

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916
04:02

Converting Repeating Decimals to Fractions 2

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809
09:05

Writing proportions

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782
05:50

Find an Unknown in a Proportion

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879
07:19

Find an Unknown in a Proportion 2

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810
05:47

Thomas Young's Double Slit Experiment

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736
07:32

U-substitution with ln(x)

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778
03:38

U-substitution Example 3

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667
05:32

U-substitution example 2

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657
04:03

U-substitution

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653
05:10

Trapezoidal approximation of area under curve

Khan Academy
692
08:26