The distributivity law tells that, whatever the numbers *a*, *b *and *c*, we may distribute the factor *a *on the terms *b *and *c*:

*a x **( b + c ) = a x b + a x c*

For instance:

*2 x ( 4 + 6 ) = 2 x 4 + 2 x 6*

Indeed:

*2 x 10 = 8 + 12 = 20*

But what is this useful to?

You may use it for mental calculationâ€¦ with a little help of writing!

For instance, you may find any result in the table of *12*, such as:

*8 x 12 = 8 *x ( 10 + 2 ) = 8 x* 10 + 8 x 2 = 80 + 16 = 96*

You may even multiply 2 numbers with 2...