HP10s+ Scientific Calculator. Solve Math and Science problems quickly and easily using 240 built-in-functions. Power through advanced statistics-find mean, standard deviation, variance and more with editable lists. Calculate common probability functions like permutations, combinations and factorials. Perform decimal and hexadecimal (degree/hour, minutes, seconds) conversions. Convert from decimals to fractions. The HP 10s+ Scientific Calculator is approved for use on most college placement exams.