By this device you can in fun way explain how multiplication works. This is also multiplification calculator that can multiply up to 9x9.  If only you know how to count to 81 this will work for you. (if you get 3 of that device you can multiply 999 x 999 in easy way, multiply is related to how many of device you got).

Print:

• infil 5%;
• layer 0,2mm;
• filament PLA;