to find 6x8, can I use the facts for 5x4 and 1x4

Answer 1

I'm not entirely sure what you are asking, but I'll give it a shot.

(5x4) + (1x4) is NOT the same as 6x8.

Lets look at it in detail:

6x8 = 48

5x4 = 20 and 1 x 4 = 4

20 + 4 = 24 which is not 48.

The most you could do is some factoring, but you have to make sure your numbers balance out.

For example,

considering 6 x 8.

Well 6 = 3x2
and 8 = 4x2

so 3x2x4x2 = 6x8

or in other words 2x2(3x4) = 6 x 8

or 4 (3x4) = 6x8.

There are many ways this problem can be manipulated into different forms. I hope this helped.