How could you use 5 x 6 equals 30 to find the product 6 x 6

Since you know that 5x6 is thirty, which is 5 sixes, you can find what six sixes (6 x 6) is. You just add one more six to thirty 5 x 6 to 6 x 6

You could just add six to find out what the product of 6 multiplied by 6 is.

If 5 x 6 is 30...
6 x 6 is 36.

In multiplication, the number is added by itself to get the product.
I hope you get what I mean.