Problem 2
Answer: Choice C) 3+5 = 5+3
The commutative property of addition is the idea of adding any two (or more) numbers in any order we want. In the example above, the 3 and 5 swap places. You can think of them commuting back and forth as if they are going from work to home (or vice versa).
A similar property is the commutative property of multiplication. An example would be 2*3 = 3*2 (shown in choice B).
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Problem 3
The list of choices is not showing up, so I cannot answer this one. Please update.