MIYOTA OS10 Manual De Instrucciones página 97

Multiplication
[Example]
12 x 15
[Operation]
Align 12 on the outer scale with 10 on the inner scale.
Then, 15 on the inner scale corresponds to 18 on the outer scale.
Take into account the position of the decimal point and add one zero to
obtain 180. Note that with the scales of this watch, the position of the
decimal point cannot be obtained.
Division
[Example]
300 / 15
[Operation]
Align 30 on the outer scale with 15 on the inner scale.
Then, 10 on the inner scale corresponds to 20 on the outer scale.
Take into account the position of the decimal point to obtain 20.
Reading Ratios
[Example]
50 / 20 = 30 / x
[Operation]
Align 50 on the outer scale with 20 on the inner scale.
Then, 30 on the outer scale corresponds to 12 on the inner scale.
At this point, the proportion for every value on the inner and outer
scales is "50:20".
96