we start with units column and proceed to the higher ones. In the abacus, we
start with the highest digit column. In the above example, we have to add the
tens column of the two numbers first (i.e., 4 and 6) and the units column (i.e.
8 and 7) next. This is for easy calculation through abacus.
e. While you move your left hand to the immediate left of the particular column for
setting a number, your right hand should automatically crawl to the left, following
the left hand.
f. Before taking the new problem, verify that all the beads of the abacus are
cleared.
g. The teaching of subtraction may also be carried out along with abacus addition.
II. ADDITION OF SINGLE DIGIT NUMBERS :
Following are the important steps used in adding two numbers in abacus :
A. Example : 4+ 5
a) First, set the number 4 in the units column. That is, move all 4 beads in the
units column towards the separation bar.
b) We have to add 5 in the units column. Since there is no bead to add in the lower
abacus, set the only bead of the upper abacus (with your right index finger)
which takes the value five.
c) Count the number in the units column. The answer is 9.
B. Example : 4+3
a) Set the number 4 in the units column. (Please see that the hand positions are
correct).
b) We have to add 3 in the units column.
c) Since there is no bead available in the lower abacus, go to the upper
abacus. The only bead which has the value 5 can be moved towards the separation
bar.
