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In such cases, the user may slide the upper scale to the left until its right index aligns with the 2, effectively multiplying by 0.2 instead of by 2, as in the illustration below: Here the user of the slide rule must remember to adjust the decimal point appropriately to correct the final answer.We wanted to find 2×7, but instead we calculated 0.2×7=1.4. Resetting the slide is not the only way to handle multiplications that would result in off-scale results, such as 2×7; some other methods are: Method 1 is easy to understand, but entails a loss of precision.The strips are aligned in parallel and interlocked so that the central strip can be moved lengthwise relative to the other two.The outer two strips are fixed so that their relative positions do not change.Before electronic calculators were developed, slide rules were the tool used most often in science and engineering.

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Those slide rules have special scales for those applications, as well as normal scales. The slide rule is used mainly for multiplication and division, and also for "scientific" functions such as roots, logarithms and trigonometry, but usually not for addition or subtraction. These scales are used for mathematical computations. They have a standardised set of markings (called scales).For example, to calculate 3*2, the 1 on the top scale is moved to the 2 on the bottom scale.The answer, 6, is read off the bottom scale where 3 is on the top scale.

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