HP 35s HP 35s scientific calculator - User Guide - Page 43

Example Enter the mixed numeral 12 3/8 and display it in fraction and decimal forms. Then enter ¾ and add it to 12 3/8. This example uses RPN mode. Keys:  É Display Description: The decimal point is interpreted in the normal way. When  is pressed the 2nd time, the display switches to fraction mode. Upon entry, the number is displayed using the current display format. Switch to fraction display mode. Enter ¾. Note you start with  because there is no integer part (you could type in 0 ¾). Add ¾ to 12 3/8. Switch back to the current display mode. Refer to chapter 5, "Fractions," for more information about using fractions. Messages The calculator responds to error conditions by displaying the  annunciator. Usually, a message will accompany the error annunciator as well. To clear a message, press  or ; in RPN mode, you will return to the stack as it was before the error. In ALG mode, you will return to the last expression with the edit cursor at the position of the error so that you can correct it. Getting Started 1-27