<Li> conversion of units </Li> <P> While most scientific models have traditionally used a single - line display similar to traditional pocket calculators, many of them have more digits (10 to 12), sometimes with extra digits for the floating point exponent . A few have multi-line displays, with some models from Hewlett - Packard, Texas Instruments, Casio, Sharp, and Canon using dot matrix displays similar to those found on graphing calculators . </P> <P> Scientific calculators are used widely in situations that require quick access to certain mathematical functions, especially those that were once looked up in mathematical tables, such as trigonometric functions or logarithms . They are also used for calculations of very large or very small numbers, as in some aspects of astronomy, physics, and chemistry . </P> <P> They are very often required for math classes from the junior high school level through college, and are generally either permitted or required on many standardized tests covering math and science subjects; as a result, many are sold into educational markets to cover this demand, and some high - end models include features making it easier to translate a problem on a textbook page into calculator input, e.g. by providing a method to enter an entire problem in as it is written on the page using simple formatting tools . </P>

What is the difference between a calculator and a scientific calculator