Citizen H461 - Slide Rule for Conversions and Basic Math; Converting Statute Miles; General Multiplication and Division

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2. Division
Question: 250/20
Solution: Align 25 on the outside scale with 20 on the inside scale. On the outside scale
read the 12.5 mark that is aligned with
X
10
on the inside scale. figure the
number of decimal places, and the answer is 12.5.
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B. General calculation functions
1. Multiplication
Question: 20 M 15
Solution: Align 20 on the outside scale with
X
10
on the inside scale, and read the outside
scale at the 30 mark which is aligned with 15 of the inside scale. Figure the
number of decimal places, and the answer is 300. Remember: decimal places
cannot be read on this scale.