Again it’s to show your work. Unless you’re your own boss, someone should be reviewing the cash collection and making sure the totals are right. Often cash collections and even AR departments list and sum up the transactions received. You aren’t exporting your calculations from your phone. The next most common replacement is excel and the amount of people who will hard code totals rather than use a sum function will blow your mind. That’s why these are still used. I can see that you actually went through and added the figures up, and you can’t just hardcore a total that you think is correct/matches with these. It’s a check against mistakes.

I mean I don’t mind using excel. I use it pretty heavily and ngl I’m generally not a big fan of using the 10 key for my everyday work but as someone who reviews work I require the people I train use it in the beginning. I’ve literally seen people incorrectly hardcore the total into the spreadsheet rather than sum it to make it match their total. You can’t really do that with these calculators.

I still use one every day

It’s to show your work and verify your totals. If you have to add a bunch of numbers you want to see that they did in fact add everything. The reason you may not want to use the calculator on your computer is that you aren’t able to see everything you added. You can use excel but you would be surprised the amount of people who will hard code the sum total rather than using the sum function which creates the potential for errors. It’s the biggest pain to find the error on why your numbers don’t reconcile when this happens because you’re checking the totals and they are wrong.

I still use one of these at work. They can be pretty useful when showing work. I make the people I train learn it because I kept catching them hard coding cells in excel and when they do the calculation wrong it takes forever to find.