Kyocera 1155 User Manual page 86

C Clear all numbers entered and display a zero.
MR Display the value currently stored in memory.
M+ Add the displayed digit to the value stored in memory.
MC Clear the value currently stored in memory.
± Change the sign of the displayed number.
Clear one function or one digit from the screen and return the
calculator to digit entry mode. Hold down to clear all of the digits
and operations and display a zero.
Exit the calculator and return to home screen.
69 Using Tools