Citizen ad2992-59p Reference Guide

10

11

English

250 ÷ 20

Adjust 25 of the outer scale until it points to 20 of the inner scale.

You can read the digit 12.5 from of the scale of the outer scale corresponding to 10 

of the inner scale and get the answer 12.5.

30/20 = 60/A

Adjust 30 of the outer scale until it points to 20 of the inner scale.

You can read the digit 40 from of the scale of the inner scale corresponding to 60 of 

the outer scale and on all the positions above the scale, the ratio between “inner and 

outer” is the ratio between “30 and 20”. Therefore, you can determine the answers of 

other ratios.