Oldest

Basic Addition

Khan Academy
876
07:43

Basic Subtraction

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853
08:32

Adding Mixed Numbers

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1102
02:05

Adding Mixed Numbers with Unlike Denominators

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880
05:15

Adding Mixed Numbers Word Problem

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843
03:21

Subtracting Mixed Numbers

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958
03:58

Subtracting Mixed Numbers 2

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944
04:53

Multiplying Mixed Numbers

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1870
04:20

Dividing Mixed Numbers

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1148
02:40

Converting Repeating Decimals to Fractions 1

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985
04:02

Converting Repeating Decimals to Fractions 2

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883
09:05

Writing proportions

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828
05:50

Find an Unknown in a Proportion

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941
07:19

Find an Unknown in a Proportion 2

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847
05:47

Thomas Young's Double Slit Experiment

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793
07:32

U-substitution with ln(x)

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820
03:38

U-substitution Example 3

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700
05:32

U-substitution example 2

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688
04:03

U-substitution

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685
05:10

Trapezoidal approximation of area under curve

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723
08:26