Oldest

Basic Addition

Khan Academy
850
07:43

Basic Subtraction

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831
08:32

Adding Mixed Numbers

Khan Academy
1027
02:05

Adding Mixed Numbers with Unlike Denominators

Khan Academy
817
05:15

Adding Mixed Numbers Word Problem

Khan Academy
785
03:21

Subtracting Mixed Numbers

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896
03:58

Subtracting Mixed Numbers 2

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882
04:53

Multiplying Mixed Numbers

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1650
04:20

Dividing Mixed Numbers

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1051
02:40

Converting Repeating Decimals to Fractions 1

Khan Academy
923
04:02

Converting Repeating Decimals to Fractions 2

Khan Academy
815
09:05

Writing proportions

Khan Academy
789
05:50

Find an Unknown in a Proportion

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888
07:19

Find an Unknown in a Proportion 2

Khan Academy
819
05:47

Thomas Young's Double Slit Experiment

Khan Academy
743
07:32

U-substitution with ln(x)

Khan Academy
785
03:38

U-substitution Example 3

Khan Academy
673
05:32

U-substitution example 2

Khan Academy
662
04:03

U-substitution

Khan Academy
660
05:10

Trapezoidal approximation of area under curve

Khan Academy
698
08:26