clkirby1/khan-exercises — comment on commit 953520eb8a95cc46ad505b8d9dc89cf5b995ee44
File: exercises/number_properties_terminology_1.html line 65
By clkirby1:

I changed this to "In contrast to the Commutative Property, the Associative Property justifies rearranging our parentheses. For example, adding (4+2)+3 is equivalent to adding 4+(2+3)."