Students are overheard making the following statements. What properties justify their statements?
a. I know that 9 7 is either 63 or 69 and I know they can’t both be right.
b. I know that 9 0 is 0 because I know that any number times 0 is 0.
c. Any number times 1 is the same as the number we started with, so 9 1 is 9
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