Napier's Local Arithmetic Board
Napier’s Board is quite marvelous! It uses binary numbers to perform multiplication with multi-digit multiplicands and multipliers. Children who have previous experience with the Multi-Base Bead Frame, will particularly appreciate how quickly the board converts a base ten number into base two (binary).
The Board itself contains peg holes, arranged in columns, and pegs to help us calculate. Along the bottom and right-hand sides are unlabeled holes, to allow us to convert base ten numbers into binary; if it has a peg in it, we read “1”, if it’s empty, we read “0”. In the labeled section, the bottom right corner is “1”. Moving up from 1, the numbers double up to 128 in the top right-hand column. Moving to the left from 1, the numbers double in this row, moving right to left, all the way to 32,768 in the bottom left corner. This doubling when you move up a column or to the left in a row, fills out the rest of our board. A depository well for pegs is at the very bottom for convenience.
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Price:
Regular price $32.99
- Price unit:
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Sku:
M574
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Order "Napier's Local Arithmetic Board" by 6 PM for next-day delivery!
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FAQ's
Please read our frequently asked questions to find out more.
Where are Alison's Montessori materials manufactured?
Our Premium Line materials are carefully crafted in our own factory in Sri Lanka, where each item is made with the utmost care and attention to detail to ensure exceptional quality and durability.
Does Alison's Montessori accept Purchase Orders (POs) from schools?
Yes, we accept Purchase Orders from public schools and charter schools. The PO must be on a school or organization letterhead, signed by the Director or an authorized representative. You can place the order online and select the PO payment method, then fax us the signed PO.
What should I do if my materials arrive damaged?
Please call or email us immediately if your materials arrive damaged. Our customer service representatives will work to resolve the issue promptly. We ask that you retain the original shipping carton and packing materials.
Do you offer international shipping?
Yes, we ship internationally. For deliveries outside of North America, we typically use DHL, USPS, or any other carrier. Please contact our customer support line for assistance with international orders, especially those over a certain dollar amount, which may require payment via wire transfer.