Oldest

Basic Addition

Khan Academy
898
07:43

Basic Subtraction

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873
08:32

Adding Mixed Numbers

Khan Academy
1140
02:05

Adding Mixed Numbers with Unlike Denominators

Khan Academy
917
05:15

Adding Mixed Numbers Word Problem

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871
03:21

Subtracting Mixed Numbers

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1012
03:58

Subtracting Mixed Numbers 2

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977
04:53

Multiplying Mixed Numbers

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1961
04:20

Dividing Mixed Numbers

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1201
02:40

Converting Repeating Decimals to Fractions 1

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1022
04:02

Converting Repeating Decimals to Fractions 2

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923
09:05

Writing proportions

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852
05:50

Find an Unknown in a Proportion

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982
07:19

Find an Unknown in a Proportion 2

Khan Academy
871
05:47

Thomas Young's Double Slit Experiment

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828
07:32

U-substitution with ln(x)

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847
03:38

U-substitution Example 3

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722
05:32

U-substitution example 2

Khan Academy
711
04:03

U-substitution

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712
05:10

Trapezoidal approximation of area under curve

Khan Academy
743
08:26