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A number line puts numbers in order and shows how far apart they are. Reading one means working out what each tick mark is worth first, then locating the value. Questions ask which number sits between two others, or what a marked point must be.
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-13 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.