Mammoth Memory

Multiplication works both ways

 `AxxB`  is the same as  `BxxA`

Any number A multiplied by another number B is the same as B multiplied by A.

This makes many multiplications much easier because, for instance, it is easier to multiply

           `2 times 8 = 8 + 8 = 16`

Than `8times2=2+2+2+2+2+2+2+2=16`

 

Example 1

`8times4=4times8=8+8`  then  `16times2=32`

 

Example 2

`6times7=7times6=6times6+6=36+6=42`

 

Further examples

`2times3`

`=`

`3xx2`

 

`3xx4`

`=`

`4xx3`

 

`4xx5`

`=`

`5xx4`

`2xx4`

`=`

`4xx2`

 

`3xx5`

`=`

`5xx3`

 

`4xx6`

`=`

`6xx4`

`2xx5`

`=`

`5xx2`

 

`3xx6`

`=`

`6xx3`

 

`4xx7`

`=`

`7xx4`

`2xx6`

`=`

`6xx2`

 

`3xx7`

`=`

`7xx3`

 

`4xx8`

`=`

`8xx4`

More Info