[M+]: Adds the number shown on the display to the number stored in the memory.
Example: 3*2 + 2*6. If you put these numbers directly into the calculator, you will see the wrong answer: 48. If you press [3*2], [M+], [2*6], [M+] and then [MR] once, you will get the correct answer: 18.
[M-]: Subtract the number stored in memory from the number shown on the display.
[GT]: Cumulative amount
[MRC]: Retrieve the saved value and then perform the synthesis operation.
[TRIANGLE]: Delete Key
[√ ̄]: Root Key