Hasbro Princess Dear Diary 71-554 Instruction Manual page 13

Use ENTER as the equal sign.
Use SPACE or AC to clear memory.
For example :
600 (
Display shows : 24
Next example : clear memory (AC or SPACE)
13 + (
+
Display shows : 24
continuing the example with the last result:
x ( x ) 25 = (ENTER)
Display shows : 600
Press QUIT or MENU to return to the Main Screen.
) 25 = (ENTER)
) 11 = (ENTER)
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13