Money and change

Working with coins and notes means adding amounts, giving change, and finding which combinations are possible. It is arithmetic with a constraint: some totals cannot be made with the coins available, and that is often the actual question.

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Work through it

LearnWhat it is, how to spot it, a worked example, and where it goes wrong.
Practice — 3-point ladder3 problems. Three in a row finishes it.0/3 in a row · 0/3 solved
Practice — 4-point ladder1 problem. Three in a row finishes it.0/3 in a row · 0/1 solved
Practice — 5-point ladderNo problems written at this tier yet.Nothing written at this tier yet
Skill quizFinish every ladder that has problems first.Finish the ladders above first

Before and after

Needs first

Nothing. This is one of the skills the Atlas starts from.

Opens up

NUM-10Percentages and simple discounts

In official papers

No indexed official paper question has been tagged with MOD-06 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.

See the papers indexed so far

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