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for a study of the standard slide rule shows that of all scales on the rule the c and e scales are the ones most commonly used for multiplication and division let us review these procedures using a simplified rule with enlarged figures to multiply 2.5 by 16 for example first find 25 on D and to it slide the index of C move the hairline to 16 on C and read the answer 40 under the hairline on D the ciphers and decimals required by the problem are of course placed mentally the procedure may be diagrammed like this 2.5 * 16 equal 40 to review an example in division say 30 ided 4 first find three on D and to it slide four on C move the hairline to the index and read the answer 7.5 on D again the ciphers and decimals required are added mentally division procedure may be diagrammed like this 30 divided by 4 equals 7.5 when skill has been acquired in multiplication and division problems in proportion may also be solved with the C and D scales let us take the simple proportion 4 is to two as 6
