Kenneth S. answered 09/26/16
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The question is a poor one, undoubtedly the result of the CommonCore revolution which has brought to the fore a lot of mickey mouse crud that sickens this Stanford mathematics major.
I'd simply say this is the number sixty, which has a zero in its units position and a 6 in the tens position.
You have a right to inspect the math book, and I urge you to oppose any nonsense that you encounter.