if you mean multiplication then 4x25=100 x 27 = 270
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dont know about associative property but this one is easy in your head. 4x25=100x27=2700
No.
Your brain, of course.
It depends on your computational skills.
The patterns and properties to compute mentally 120 times 30 is the numbers 12 and 3 plus the two 0. Multiply 12 by 3 (36) and add the two 0 (3600).