After first trying to put together the clues they've assembled from their previous missions, Max & Molly are sent to Wales in 1971 to stop the Trolls from causing trouble on Decimal Day.
This is the day the UK changed their money system to units of 10. Well, sure enough, the Trolls ARE up to no good and are attempting to put counterfeit coins into circulation. It's up to the Problem Solvers to use Math to discover the fake coins and save Decimal Day.
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