The best way to start learning how we can do mathematic calculations using an Abacus is to print one. Forget your smart phone calculator and enjoy this ancient calculating tool.

Again Fusion 360 has been very helpful for me to draw it. First lets built it!

Print one frame  and 63 beads ( 9 rows of 2 and 9 rows of 5). I have used 3D printer filament as wires ( 1,75 mm). Drill 2 mm diameter thru the frame to enlarge all the side holes. Cut filament wires longer for easy assembling.

When assembly is completed, add a drop of super glue to the filament wires to both sides and shift the wires by 2 mm to have the glue between the frame and the wires. When dried, cut the excess of wire as shown on the picture below.

There are many tutorials how to use an Abacus on line.