Oldest

Basic Addition

Khan Academy
897
07:43

Basic Subtraction

Khan Academy
873
08:32

Adding Mixed Numbers

Khan Academy
1140
02:05

Adding Mixed Numbers with Unlike Denominators

Khan Academy
914
05:15

Adding Mixed Numbers Word Problem

Khan Academy
871
03:21

Subtracting Mixed Numbers

Khan Academy
1012
03:58

Subtracting Mixed Numbers 2

Khan Academy
975
04:53

Multiplying Mixed Numbers

Khan Academy
1960
04:20

Dividing Mixed Numbers

Khan Academy
1200
02:40

Converting Repeating Decimals to Fractions 1

Khan Academy
1022
04:02

Converting Repeating Decimals to Fractions 2

Khan Academy
922
09:05

Writing proportions

Khan Academy
850
05:50

Find an Unknown in a Proportion

Khan Academy
982
07:19

Find an Unknown in a Proportion 2

Khan Academy
869
05:47

Thomas Young's Double Slit Experiment

Khan Academy
827
07:32

U-substitution with ln(x)

Khan Academy
846
03:38

U-substitution Example 3

Khan Academy
720
05:32

U-substitution example 2

Khan Academy
710
04:03

U-substitution

Khan Academy
712
05:10

Trapezoidal approximation of area under curve

Khan Academy
743
08:26