WTF? This Is How They Teach Math to Kids Now
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I suggest home school. I don't know of one place where you go to buy something and the cashier can make change without the register telling them how much change to give you back. Last time we went for a burger, the bill was something like $27.32. I gave the girl a 20 and a 10 and she put it in the register. I then gave her the 32 cents and she was so confused I had to take my 32 cents back and take the change the register told her to give. They cannot do basic math in their head.
I worked in restaurants and I always taught how to count change and not rely on what the register said. If you punch in the wrong amount tendered the change will be wrong, too. Happened at one place I worked and the mindless cashier gave the customer $200 back instead of $20!
It's not hard. Start with the amount due and count up to amount tendered. If you get coin that means the customer wants just dollars back, i.e. $27.32 becomes $27.
I also taught double counting to ensure accuracy. Count it once as you take it out of the register and again as you give it back to the customer. Easy peasy!