Buy these Pocket Guides on their own, or order the Numeracy Rules kit with one Pocket Guide included.

When folded, the pocket guide measures 3.5″ x 4.25″.

The Pocket Guide acts as a ruler and provides a quick reference to math conversions and formulas such as:

Imperial, metric, weight load estimation, 3-4-5 method, trigonometry, perimeter, area, volume, decimals of a foot, converting fractions to decimals, decimals to fractions of an inch.