Oldest

Basic Addition

Khan Academy
831
07:43

Basic Subtraction

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813
08:32

Adding Mixed Numbers

Khan Academy
1002
02:05

Adding Mixed Numbers with Unlike Denominators

Khan Academy
797
05:15

Adding Mixed Numbers Word Problem

Khan Academy
760
03:21

Subtracting Mixed Numbers

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874
03:58

Subtracting Mixed Numbers 2

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860
04:53

Multiplying Mixed Numbers

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1633
04:20

Dividing Mixed Numbers

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1034
02:40

Converting Repeating Decimals to Fractions 1

Khan Academy
904
04:02

Converting Repeating Decimals to Fractions 2

Khan Academy
797
09:05

Writing proportions

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770
05:50

Find an Unknown in a Proportion

Khan Academy
867
07:19

Find an Unknown in a Proportion 2

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798
05:47

Thomas Young's Double Slit Experiment

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725
07:32

U-substitution with ln(x)

Khan Academy
766
03:38

U-substitution Example 3

Khan Academy
652
05:32

U-substitution example 2

Khan Academy
646
04:03

U-substitution

Khan Academy
643
05:10

Trapezoidal approximation of area under curve

Khan Academy
680
08:26