When this multiplication grid has been completed, how many answers will be an even number?
A 9 B 15 C 16 D 20 E 25
C
This could be done by filling in the grid and counting up the even answers. But recognition that multiplying by an even number produces an even answer means that the rows and columns headed by an even number will produce the even answers and hence there are 16 even numbers for answers, answer C
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