# Arithmetic kit – educational mechanical model kit

Regular price C\$36.90
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## Assemble the Arithmetic Kit and discover how the Mechanical Addiator and Mechanical Multiplier work.

• The model kit comes with a QR-code to the study guide about the mechanisms, the principal of their working, the main characteristics, formulas. It also includes interesting assignments.
• Dive into augmented reality and look at how Mechanical Addiator and Mechanical Multiplier work. Interact with the models via a special AR application from Ugears.

UGEARS' Arithmetic Kit, part of UGEARS' STEM Lab collection, consists of two ready-to-assemble models: A Mechanical Addiator and a Mechanical Multiplier.

Find out how the Mechanical Addiator and Mechanical Multiplier work

The Mechanical Addiator is a compact arithmetic machine (or adding machine) that works by moving gear racks, using a stylus included in the kit. By moving the sliding racks, marked with arrows and numbers from 0 to 9, you can add and subtract numbers.

The Mechanical Multiplier is a flat hinge mechanism that accomplishes binary operations on numbers. By moving the dual slider, you can multiply and square numbers from 1 to 12, making the multiplication table fun.

Who invented the Mechanical Addiator and Mechanical Multiplier, and when?

The UGEARS Mechanical Addiator is a DIY wooden model kit based on an addiator that was invented by a St. Petersburg music teacher, Heinrich Kummer, in 1846. Its simple design and compact size made it a popular mathematical tool in its time. Today this simple, fun mechanism is part of UGEARS' outstanding STEM Lab collection.

The UGEARS Mechanical Multiplier is a fun wooden 3D puzzle based on a children's toy, “Consul the Educated Monkey,” invented in 1915 by William Henry Robertson, an American high school math teacher. Robertson applied for a patent for a toy that ingeniously uses a hinged mechanism to perform simple multiplication, designed "to stimulate children's interest in the study of numbers.”

Uses for The Mechanical Addiator and Mechanical Multiplier

The Mechanical Addiator is used to add and subtract numbers. To do this, the user enters a number value using the stylus, then uses the stylus to enter a second number. The device then shows the result of the desired mathematical operation, according to where the second number was entered (top row for addition, bottom row for subtraction). But the Addiator is not limited to addition and subtraction—you can also use it to multiply and divide.

The Mechanical Multiplier is a simple and interesting way to learn the “unloved” multiplication tables from 1 to 12, and to understand the simple principle of hinge-lever mechanisms. When the two sliders are moved to various numbers, you will see their product displayed in the window above.

Components of the Mechanical Addiator and Mechanical Multiplier, and how they work

The Mechanical Addiator consists of a housing in which four rails or racks are set, with printed values on them. A stylus is used to input values. Numbers are entered from cam slots, and the results are displayed in four center windows. Before starting an addition/subtraction operation using the stylus, the racks should be set so that all windows display "0". The value of the number on which the operation is performed is first entered using the top row of slots; the top slots are then used to add a second number, while the bottom ones are used for subtraction.

The Mechanical Multiplier consists of two sliders which move along a number line (1-12), and a lever system which transfers the movement of the sliders to a “Results” window, which moves along a value field. As you move the two sliders between different number values, the product of their multiplication will appear in the “Results” window. In order to multiply a number by itself (to square it), the right slider should be moved to the extreme right position and fixed at the “X²” symbol.

• Housing
• Rack
• Stylus

The Mechanical Multiplier consists of:

• Sliders
• Lever system
• Results window
• Value field

Ugears STEM puzzles are designed to suit different age groups with a special focus on learning component. The assembly of the model will be interesting and won’t take much time.

### STEM Lab Model kits come with all you need in a box.

Just like the rest of Ugears wooden model kits, putting STEM Lab models together is fun and comprehensive: everything you need to build, learn, and discover comes in a box. There you will find:

• Wooden details pre-cut with a precise high-tech laser in high-quality plywood boards, as well as other materials required for assembly. DIY kits need no glue or additional instruments to build. The details come out of the board with a slight push.
• Step-by step illustrated instruction manual of 3D puzzle assembly.
• QR-code to download a pocket study guide about the Ugears model, its mechanism, principle of its working, main characteristics, physical and mechanical formulas, and fun practical tasks.
 Addiator size: 8.5*4.3*0.91 in (21.5*11*2.3 cm)Multiplier size: 9.8*10*1.6 in (24.8*25.5*4 cm)Package size: 8.07*7.4*2.48 in (20.5*18.8*6.3 cm)Number of components: 117Estimated time for assembly: 2,5 hours

Currently we don't provide delivery outside of Canada.

Orders over CA\$49.90 qualify for free domestic shipping. A shipping rate of CA\$9.90 applies to orders under CA\$49.89. Priority Shipping is CA\$19.50.

There is one business day processing, so generally the delivery will take between 2 and 5 business days with standard shipping and 1-3 business days with priority shipping, depending on your location. Orders are not shipped or delivered on weekends. If there will be a significant delay in shipment of your order, we will contact you via email or telephone.

Please double check your billing and shipping address when placing an order as we are unable to reroute packages.

After you have placed an order, you have 30 minutes to cancel it if you change your mind or make a mistake.

Pick Up

Unfortunately this option is unavailable at the moment.

Back-order/Pre-Order

Items listed as pre- or back-ordered are still available for purchase and we will send them over to you as soon as we’re stocked up. We will stay in touch to keep you

### 30 DAY RETURN POLICY

At Remarkable Gifts LLC (UGEARS Canada), we stand behind each and every one of our models and ensure your purchase with our 30-days guarantee return policy. If you are not completely satisfied with your item, simply return it for a full return/refund.

Items can be returned within 30 days after the date of a purchase either for a full refund of an original purchase of an item or an exchange for a product of an equal value.

Items returned after 30 days from the date of an original receipt are not eligible for a refund/ exchange.

Shipping and handling costs are not included in the refund amounts.

Only the unused items in the original unopened package are eligible for return.

All returns must include the original receipt or a proof of purchase.

Please, package your return purchased item along with all original accompanying materials that were shipped with the item into a securely sealed shipping box. Mail all return items along with receipts/proof of purchase to:

### RETURN PROCESS

We will inspect your returned item and make a decision about return/refund eligibility within 2-4 business days.

Once an item is accepted for return, Remarkable Gifts LLC will issue a full refund, exchange, or credit within 10-20 business days.

Once an order return processing started, it can be cancelled within 1 business day from the date of initial processing. After that time, an order can not be cancelled. However, it still may be returned within a 30-day return period for refund, credit, or exchange.

Please, keep in mind that Remarkable Gifts LLC is not responsible for the loss/damage of shipped items during the return process.

In case you receive a damaged or a wrong product, we cover the return shipping fees.

At Remarkable Gifts LLC we are constantly reinventing and reimagining our models. If you have feedback you would like to share with us, please contact us info@ugears-models.ca and share your thoughts! We appreciate your suggestions and are grateful for feedback. Your opinion matters when we are reviewing our existing models and are in a process of developing new ones.

### REFUNDS (IF APPLICABLE)

We will notify you when we receive your returned item. Please allow 2-4 business days as we inspect returned an item and make a decision whether or not an item is eligible for a full refund/replacement.

Upon approval you refund will be issued and reimbursed to the original method of payment. Refunds and exchanges do not include packaging or shipping costs.

### DELAYED/MISSING REFUNDS (IF APPLICABLE)

If your refund has not been issued within the indicated number of days, please check your payment account. If the refund has not been applied to your payment account contact your bank as it may take additional time for your refund to reflect on your account. There is often a processing delay before refunds are posted.

### SALE ITEMS

Only regular priced items are eligible for replacement/refund.

### EXCHANGES (IF APPLICABLE)

The only items eligible for replacement/refund are the ones that were received defective or damaged.

If you need to exchange a defective/damaged item, contact us via the e-mail: info@ugears-models.ca

We review your claim and notify you whether or not your item is eligible for replacement. You then should mail your item back to us along with an original receipt/proof of purchase to:

NO GLUE CONNECTION

SELF-ASSEMBLY

MECHANICAL

## Customer Reviews

Based on 1 review
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M
Millie Hilts
Always great

These were four of the several kits I have ordered. The kits are everything they say they will be and more. Service on any issues has been quick and dealt with, (the customer) in a professional and friendly manner. I cannot say enough good, about the products and the service.

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