What is the size of each ball?

They are about 1 inch in diameter

What is the size of the balls?

They are about 1 inch in diameter

How would you use it to teach sums over 10?

You would use it per place value. 12 plus 11 Ok we put 2 in for the ones place then 1. How many is in our ones place 3 Let’s look at the tens, 1 and 1 we have 2 for the tens place Or 22 plus 18 Let’s put 2 in and then 8. Uh oh we made a 10 we need to save one bead to put into our tens place now. Put in 2 for “20” and 1 for “10” and then our 1 from the ten we made for the ones place. Hope this helps :)

Where can I purchase more balls? We have lost some of them

Hello, unfortunately we do not stock replacement parts for purchase. We do apologize, feel free to reach out on our site under the contact us page with any other questions you may have.

Product Dimensions	29.67 x 17.81 x 10.31 cm; 453.59 g
Manufacturer recommended age	4 - 10 years
Item model number	LER6368
Educational Objective(s)	Math
Language:	English, French, German, Spanish
Number of Game Players	1
Number of Puzzle Pieces	120
Assembly Required	No
Batteries Required?	No
Batteries Included?	No
tech_spec_battery_description_toys	No batteries required
Material Type(s)	Metal
Remote Control Included?	No
Remote Control Type	No
Color	Multi-color
ASIN	B01N2QTE3K

Magnetic Adding Machine

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