Why using both hand finger and particularly certain finger to certain value?
Speed is very important as well as accuracy. If we using single finger for all bead movement, Time taken will be more for calculation some calculation to add or subtract for a single digit will take four bead movement. Say for e.g. adding 9 with 45 this takes four movement (add 50 with left middle finger less 40 with left index finger, less 5 with right index and add4 with right thumb) These four beads movements are happening in a single movement within a fraction of second. Typing in typewriter is a good example for this. If we use proper finger for proper number key can type faster. Not only that while moving beads with left hand the right side of the brain hemisphere and with right hand finger left side of the brain hemisphere will be stimulated and both sides will be coordinated. Usage of proper finger yield better and faster result.
