Set indicator over the dividend 6.70 on the D scale. Move the slider
until the divisor 2.12 on the C scale is under the hair-line. Then read
the result on the D scale under the left-hand index of the C scale. As
in multiplication, the decimal point must be placed by a separate
process. Make all the digits except the first in both dividend and
divisor equal zero and mentally divide the resulting numbers. Place the
decimal point in the slide rule result so that it is nearest to the
mental result. In example 15, we mentally divide 6 by 2. Then we place
the decimal point in the slide rule result 316 so that it is 3.16 which
is nearest to 3.
A group of examples for practice in division follow:
Example
16: 34 / 2 = 17
17: 49 / 7 = 7
18: 132 / 12 = 11
19: 480 / 16 = 30
20: 1.05 / 35 = .03