Oldest

Basic Addition

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721
07:43

Basic Subtraction

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704
08:32

Adding Mixed Numbers

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878
02:05

Adding Mixed Numbers with Unlike Denominators

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689
05:15

Adding Mixed Numbers Word Problem

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649
03:21

Subtracting Mixed Numbers

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768
03:58

Subtracting Mixed Numbers 2

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753
04:53

Multiplying Mixed Numbers

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1524
04:20

Dividing Mixed Numbers

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928
02:40

Converting Repeating Decimals to Fractions 1

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792
04:02

Converting Repeating Decimals to Fractions 2

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687
09:05

Writing proportions

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660
05:50

Find an Unknown in a Proportion

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758
07:19

Find an Unknown in a Proportion 2

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690
05:47

Thomas Young's Double Slit Experiment

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615
07:32

U-substitution with ln(x)

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651
03:38

U-substitution Example 3

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542
05:32

U-substitution example 2

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535
04:03

U-substitution

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535
05:10

Trapezoidal approximation of area under curve

Khan Academy
566
08:26