Abacus beginners are taught finger method first before learning how to do the calculations on the real Abacus.The right hand is the units hand( 1-9) and left hand is the tens hand (10-90) .Through this method you can count till 99 .We can even add or subtract through this method one or two digits numbers for example:82 +14 =96 or 94-28=66. Counting 1 to 10. Counting 11 to 99. Addition and Subtraction examples