Oldest

Basic Addition

Khan Academy
828
07:43

Basic Subtraction

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810
08:32

Adding Mixed Numbers

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999
02:05

Adding Mixed Numbers with Unlike Denominators

Khan Academy
794
05:15

Adding Mixed Numbers Word Problem

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757
03:21

Subtracting Mixed Numbers

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871
03:58

Subtracting Mixed Numbers 2

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857
04:53

Multiplying Mixed Numbers

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1630
04:20

Dividing Mixed Numbers

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1031
02:40

Converting Repeating Decimals to Fractions 1

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901
04:02

Converting Repeating Decimals to Fractions 2

Khan Academy
794
09:05

Writing proportions

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767
05:50

Find an Unknown in a Proportion

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864
07:19

Find an Unknown in a Proportion 2

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795
05:47

Thomas Young's Double Slit Experiment

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722
07:32

U-substitution with ln(x)

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763
03:38

U-substitution Example 3

Khan Academy
649
05:32

U-substitution example 2

Khan Academy
643
04:03

U-substitution

Khan Academy
640
05:10

Trapezoidal approximation of area under curve

Khan Academy
677
08:26