Warning: This is 3.0 Edition material. It is possible that there is more recent 3.5 Edition version.
Inaccurate?

Easy Math

(Song and Silence: A Guidebook to Bards and Rogues)

Transmutation
Level: Bard 0,
Components: V, S,
Casting Time: 1 action
Range: Personal
Target: You
Duration: 1 round
Saving Throw: No (see below)
Spell Resistance: Yes (harmless)

This minor magical effect makes counting and calculating a breeze.

You can estimate the number of gold pieces in a pile, the distance of a gap you might have to leap, the number of foes rushing toward you, or the like—all in a flash. To make such an estimate, make a Perform check (DC 15).

Success means your guess is within 10% of the true figure; failure means it is off by 20% or more. The exact extent of such a miscalculation is up to the DM.

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