# Slide Rule Basics

## how to place the decimal point

Whether you are multiplying 1200 by 4, or 120 by 4, it is all represented as 1.2 x 4 on a slide rule. As the result is read out to be 4.8, **where to place the decimal point?**

Except for simple cases that you can estimate the results, it’s often difficult, or counter-intuitive to place the decimal point correctly for slide rule calculations.