Oldest

Basic Addition

Khan Academy
887
07:43

Basic Subtraction

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864
08:32

Adding Mixed Numbers

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1132
02:05

Adding Mixed Numbers with Unlike Denominators

Khan Academy
904
05:15

Adding Mixed Numbers Word Problem

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862
03:21

Subtracting Mixed Numbers

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984
03:58

Subtracting Mixed Numbers 2

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966
04:53

Multiplying Mixed Numbers

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1953
04:20

Dividing Mixed Numbers

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1193
02:40

Converting Repeating Decimals to Fractions 1

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1011
04:02

Converting Repeating Decimals to Fractions 2

Khan Academy
914
09:05

Writing proportions

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841
05:50

Find an Unknown in a Proportion

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974
07:19

Find an Unknown in a Proportion 2

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861
05:47

Thomas Young's Double Slit Experiment

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818
07:32

U-substitution with ln(x)

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838
03:38

U-substitution Example 3

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711
05:32

U-substitution example 2

Khan Academy
704
04:03

U-substitution

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701
05:10

Trapezoidal approximation of area under curve

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735
08:26