the keyboard (20 to the left of the keyboard decimal

decimals for a group of problems involving addition and

marker and .125 to the right).

subtraction, examine the numbers in all the problems

and determine which has the largest number of decimal

operating crank five turns forward. Shift the carriage one

places.

Set the keyboard decimal marker to

place to the right. Make two forward turns. Shift the

accommodate this number of decimal places. Set the

carriage to the right. Make four forward turns.

lower dial decimal at the same number. The upper dial

decimal is a zero (0). For example, to add 12.25 to 3.333

or to subtract 75.242 from 160.0:

8.553125. Not that the .425 appears in the upper dial to

the right of the decimal marker and the lower dials

decimal marker correctly points off the answer.

keyboard and lower dial to 3 because three is the

greatest number of decimal places that appears in these

problems to avoid changing the decimal markers for

figures.

every problem. To do this for a group of multiplication

problems, simply find the largest number of decimal

they are written. The figures that appear to the left of the

places appearing in the numbers to be set on the

decimal point should be set to the left of the keyboard

keyboard. Set the keyboard decimal marker for this

decimal marker, and those that appear to the right of the

number. Find the largest number of decimal places to

decimal should be set to the right of the keyboard

be entered in the upper dials. Set the upper dial decimal

decimal marker.

for this number. Set the lower dials decimal at the sum

of these two. Enter all figures around these preset

subtraction given in d (1) and (2) above, and the result

decimals and the results will be all correct. The following

will always be correct.

example illustrates this:

24.75 x .35 = 8,6625

number on the keyboard and, with the operating crank,

32.5 x .24 = 7.8

turn the other number into the upper dials. When this is

110.333 x 1.4 = 154.4662

done, the answer appears in the lower dials. Therefore,

The largest number of decimal places in the numbers

when multiplying decimal numbers, set the keyboard

which go on the keyboard is three; in the numbers which

decimal marker to accommodate the largest number in

go in the upper dials, two. Therefore, the decimal setting

the problem and the upper dials decimal marker to

should be:

accommodate the other number. Then, following the

Upper dials

2

rule for decimals (h above), add the number of decimal

Keyboard 3 Lower dials

5

places on the keyboard to the number of decimal places

in the upper dials and set the lower dials decimal marker

instructions for simple division, both numbers (divided

at this number of decimal places. This is exactly how

and divisor), are set on the keyboard. Therefore, when

you point off the decimal when multiplying by pencil and

working with decimal numbers, examine all numbers to

paper; add the number of decimal places in the two

find the largest number of decimal places appearing in

numbers and point off this many places in the result. All

the whole group of problems at hand. Set the keyboard

decimal markers should be set before beginning any of

decimal at this number. To set the upper dials decimal

the work. For example, to multiply 20.125 by .425:

always decide how many decimal places are required in

the answer and set the decimal marker to one more

keyboard. It has three decimal places so the keyboard

place than this (to permit rounding off). Again, for the

decimal marker should be set at three. Set the other

lower dials decimal, add the keyboard and upper dials

number (.425) in the upper dial, setting the upper dials

decimal and set the lower dials decimal at this number.

decimal at three. Add the two (3 + 3 = 6) and set the

lower dials decimal at six. Set the decimal markers

accordingly and do the above example following the step

by step instructions below.

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