It can be used to simplify addition or multiplication of large sets of numbers - but only if you know number bonds.
Ti calculate 3*4*5 you could calculate 3*4 = 12 and then 12*5 = 60
but it is easier to do 4*5 = 20 and 3*20 = 60.
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Associative property of addition
it cant, its just a useful thing that you will be tested on and asked to know this stuff for the rest of your life probably for no reason because there is no reason to use this in the real world so there ya go, sorry!
45*60 can be written as (40+5)*60 and the distributive propoerty used to evaluate it. However, the associative property is much better 45*60 = 45*(2*30) = (45*2)*30 = 90*30 = 2700
The following rules apply to all real numbers.if either number is zero, then the product is zero.if the signs of two numbers are the same, their product is positive; if the signs are different then the product is negative.for the product of three or more numbers, the associative property can be used to find the product two-at-a-time.