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Step 7How to add + subtract
Start by resetting the abacus (all beads away from centre bar).
Without markings on my abacus, the decimal place can be moved according to application requirements.
In this example, add the number 218.25 to 30.12.
To start, we tally 218.25 on the abacus, then simply add 30.12 counting up from right to left just like normal addition. Only beads closest to the middle are counted.
Adding the two we get 248.37
Let's move on to something more complex..
Without markings on my abacus, the decimal place can be moved according to application requirements.
In this example, add the number 218.25 to 30.12.
To start, we tally 218.25 on the abacus, then simply add 30.12 counting up from right to left just like normal addition. Only beads closest to the middle are counted.
Adding the two we get 248.37
Let's move on to something more complex..
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