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Taking a fraction of an amount means splitting it into equal parts and keeping some of them. Two thirds of 12 is 8 because 12 splits into three fours and you keep two of them. The trouble is always keeping straight what the whole is.
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Nothing. This is one of the skills the Atlas starts from.
No indexed official paper question has been tagged with NUM-09 yet. The index grows one paper at a time, and it records only question numbers, point values and our own skill tags — never the problems themselves.