Animated Abacus
Animated Abacus is a magic item (wondrous item) of common rarity.

Summon this item
Describe it your way — Animated Abacus is already filled in.
If you speak a mathematical equation within 5 feet of this abacus, it calculates the equation and displays the solution. If you are touching the abacus, it calculates only the equations you speak, ignoring all other spoken equations.
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Further reading
Jetpack7 Game Master SeriesThe Game Master's Book of Random Encounters
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