Oldest

Basic Addition

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871
07:43

Basic Subtraction

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845
08:32

Adding Mixed Numbers

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1047
02:05

Adding Mixed Numbers with Unlike Denominators

Khan Academy
834
05:15

Adding Mixed Numbers Word Problem

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801
03:21

Subtracting Mixed Numbers

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915
03:58

Subtracting Mixed Numbers 2

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898
04:53

Multiplying Mixed Numbers

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1669
04:20

Dividing Mixed Numbers

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1069
02:40

Converting Repeating Decimals to Fractions 1

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947
04:02

Converting Repeating Decimals to Fractions 2

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837
09:05

Writing proportions

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819
05:50

Find an Unknown in a Proportion

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915
07:19

Find an Unknown in a Proportion 2

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841
05:47

Thomas Young's Double Slit Experiment

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768
07:32

U-substitution with ln(x)

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810
03:38

U-substitution Example 3

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691
05:32

U-substitution example 2

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683
04:03

U-substitution

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679
05:10

Trapezoidal approximation of area under curve

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716
08:26