ABACUS - DECIMAL ADDITION
a) The procedures for addition of decimals are same as those in the case of addition of
whole numbers. The only new aspect here is the placement of the decimal point in
the abacus.
b) The dots of the separation bar of the abacus can be used for separating the whole
number and the decimal part of the given number.
c) For example, consider 32.67. Here, the decimal part of this number has two digits.
You need only two places for setting this. Hence select the first dot of separation bar.
The 2 of the whole number can be set in the thousands column and the 3 in the ten
thousands column. The columns for whole numbers must be set to the left of the
decimal point.
d) The setting of the decimal part should start from the decimal point in the right side.
THE WHOLE NUMBER SHOULD BE SET IN THE LEFT SIDE OF THE DECIMAL POINT AND
THE DECIMAL PART IN THE RIGHT SIDE OF THE DECIMAL POINT.
e) Suppose you want to set the number 45.8972. Here, the decimal part has four digits.
Hence, select the second dot of the separation bar as the decimal point. Here, the 8
of the decimal part should be set in the 6th column from the right extreme of the
abacus, 9 in the fifth, 7 in the fourth and 2 in the third columns. The 5 of the whole
number is set in the immediate left to the decimal point, and the 4 in the eighth
column.