The TI-30Xa is an easy way to get into scientific calculators. It has a full suite of basic scientific and trigonometric functions suitable for use in general math, pre- algebra, algebra 1&2, trigonometry and biology classes. It can do basic fractional functions in standard numerator/denominator format so you don’t have to worry about converting to decimal notation. Its 10 digit display also has a 2 digit exponent display.