Question

Select the number property that will justify the step in the following expression. 2(5 17) = (2 5) 17 = 10 17 = 170

Answer 1

positions of 2, 5, 17 are not changed - so its not commutative property thats used here

Answer 2

instead of doing (5 17) first, u did (2 5) first, so you changed the grouping/association. its called \(\text{associative property}\)