25 videos in "Computation Shortcuts"

Ex 1  Multiplying numbers with 25

Ex 2  Multiplying numbers with 25

Ex 3  Multiplying numbers with 25

Ex 1  Multiplying numbers with 11

Ex 2  Multiplying numbers with 11

Ex 3  Multiplying numbers with 11

Ex 1  Multiplying numbers with 5

Ex 2  Multiplying numbers with 5

Ex 3  Multiplying numbers with 5

Ex 1  Multiplying numbers using Line Intersection

Ex 2  Multiplying numbers using Line Intersection

Ex 3  Multiplying numbers using Line Intersection

Ex 1  Dividing numbers by 25

Ex 2  Dividing numbers by 25

Ex 3  Dividing numbers by 25

Ex 1  Dividing numbers by 5

Ex 2  Dividing numbers by 5

Ex 3  Dividing numbers by 5

Ex 1  Subtracting from multiples of 10

Ex 2  Subtracting from multiples of 10

Ex 3  Subtracting from multiples of 10

Ex 1  Squaring numbers ending with 5

Ex 2  Squaring numbers ending with 5

Ex 3  Squaring numbers ending with 5

Fastest Way to Multiply by Six
Fastest Way to Multiply by Six
 How Can you quickly multiply by six?
This Video does a good job of explaining the trachtenberg system for multiplying by six. Some of the operations may confuse students who do not have any prior knowledge of the trachtenberg system.