do you mean distributive property?? and it is where you have an equation like " 4(3x+4-3) " so you would make a box and outside to the side youd put 4 because thats the number youre multiplying by. for example:
3x +4 -3
3x * 4 = 12x | 4x 4 = 16 | -3 x 4 = -12 |