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A digit's value depends on where it sits in the number. The 4 in 47 means forty, while the 4 in 74 means four. Problems about digits ask about the symbols in each position, not about the size of the whole number.
Saved in this browser only. No account, nothing sent anywhere.
Nothing. This is one of the skills the Atlas starts from.
No indexed official paper question has been tagged with NUM-01 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.