Reach And Teach says:
We love the puzzles and other wooden treasures made by our friends at Creative Craft House in Florida. This particular trick is great for the ham (or vegan Tofu lover) in the family. To do the trick you have to be fast at match and good at bantering with your audience. We heard from one customer who got this for her son. She said "He did the trick for everyone in the family, everyone who came over to visit during the holidays, and all of his friends... and he keeps on doing it! His skills at addition have improved so much and he's gone from 'hating math' to LOVING it."
About the Trick (as told on the Creative Craft House web site):
In 1927 Royal V. Heath marketed a magic effect called “The Di-Ciphering Trick” based on a math trick developed by Edmund Balducci. It consisted of these 5 dice cubes bearing a different 3 digit number on each face – 30 numbers in all. A spectator would roll the dice and the magician would quickly announce the sum of all the numbers. Quite amazing given that there are over 7700 different combination of numbers that could show on the 5 cubes. If you want to know the secret of the dice, you can watch the video, but I don't want to spoil it for those that may not want to know now. But, rest assured that if you can do quite simple addition in your head you can used these dice with great effect.
It took a bit of research for me to resurrect the dice pattern and associated magic effects, but I am please with the result as I love math puzzles and these are fascinating I think. Made here is Spring Hill with the 7/8" Dice having numbers deeply laser engraved. Also available in the wood case shown in photo.
Case with dice measures about 5 1/4" x 2 1/2" x 2"