Calculators, Splaks 2 Pack Standard Functional Desktop Calculators Sola and AA Battery Dual Power Electronic Calculator with 12-Digit Large Display (1 Basic Black&1 Updated Silver)

[M+] 

Adds the number shown on the display to the number stored in the memory. 

Example:3*8 + 2*6. If you directly inputs these numbers to the calculator,you will see the wrong answer: 156. If you press [3*8], [M+], [2*6], [M+], then press [MRC] once, you will get the right answer: 36. 

[M-] 

Subtracts the number shown on the display to the number stored in the memory. 

[MRC] 

Combination of [MR] and [MC]. 

[MR]: Recall the current memory register value. 

[MC]: Clear the memory register (set to zero). When you press the key once, the [MR] key was activated, when you press the key twice, the [MC] was activated. 

[GT] 

Whenever the [=] key has been pressed, the result will be stored into the Grand Total Memory

Example: If you want to calculate [2*3+3*5+6*8],press [2*3=], then [3*5=], then [6*8=]. Then press [GT], you will get the right answer 69 

[MU] 

Stands for Mark Up, which is for calculating GROSS PROFIT MARGIN (GPM). 

Example: Enter [100] then press the [÷], then [15] then [MU] key, you will see 117.65 (15% of this total equates to 17.65) 

[CORRECT] 

It helps you correct wrong number. If you want to press 458, but you pressed 459, you can then press [CORRECT] key to delete 9 and press [8] key again to correct it 

[AUTO REPLAY] 

It helps replay your operation you just pressed You pressed [4x5=] and you will see 20, then you press the [AUTO REPLAY] and you will see 5x, 3, 15 in the calculator screen 

[CHECK] 

It helps replay your operation step by step. You pressed [4x5=] and you will see 20, then you press the [CHECK] 3 times, you will see 4x,5,20 separately