The earliest abacus dates to 2700 BC when it was used in Mesopotamia to calculate the Sumarian sexagesimal number system. Over the millennia, it was used in various forms by the Egyptians, Persians, Greeks, Chinese, Romans, and many other civilizations. It is still used today as a teaching aid in many preschools and elementary schools. This abacus pendant (with moving steel beads!) represents both a love of mathematics and an important piece of math history. It will delight math teachers and students alike! The steel abacus measures 1 1/4 inches long and 3/4 inches wide, and has working steel beads. It comes with a 23 inch steel ball chain.
gorgeous jewelry with a purpose !! Wonderful gifts for for the intelligent students in your life!!
it's possible, on the tiny abacus, to represent up to 9 digits, though they won't stay in place through the day, as the beads are fully functional. while it's not the easiest abacus to use, it's definitely the smallest i've seen that works, and is also quite pretty. it arrived in the mail only a couple days after i ordered it, right on time for π day (pi day, 3/14/16), preceded by a friendly email exchange with the owner, who seems quite reasonable.
I recently acquired some pieces for Christmas gifts. The quality was top-notch and the packaging was perfect. My recipients were THRILLED. I am already ordering more for gifts.
The necklace looks very nice and comes in a beautiful gift package. I'm sure it will be enjoyed by my son's math teacher.
Within the United States, shipping is free for orders over $45. Buy several items-- keep some and give others as gifts! But if you don't quite hit the $45 total, First Class delivery within the U.S. is $3.50 per order, and Priority is $6.50 per order. Gift boxes are ALWAYS included for orders within the U.S. Your order will be processed and mailed within 2 business days.
|UNITED STATES||mailed within||in transit for||from ordering to arrival|
|Priority Mail||1-2 business days||1 - 3 business days||2 - 5 business days|
|First Class||1-2 business days||2 - 4 days||3 - 6 business days|
For all countries outside the United States, USPS First Class International shipping without gift boxes is $4.50 per order. Please note: USPS First Class International shipping can take a very long time to arrive, averaging 4 - 12 weeks, depending on the country. USPS tracking numbers will work only until the package leaves the United States. We will replace packages that go missing before exiting the US border, but cannot replace packages that disappear after that.
If you need quick delivery and tracking all the way to your country, please use DHL Express. This shipping method costs $32 per order, but will provide tracking at every step of the way. To estimate delivery time, allow 2 business days for us to pack and mail your order, and then add the number of shipping days shown by your country on the DHL Shipping Table.
The customer is responsible for any VAT or import tax charges.
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