Started using the last digit of my restaurant bill as a checksum, cause I've had the tip amount changed on me too many times now Decide your rough desired tip, calculate your tentative total, then add up the digits before the decimal point and use that as the number of cents

Jul 19, 2018 · 11:07 PM UTC

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Total pre-tip bill: $15.90 Rough tip: $3.00 Pre-checksum total: $18.90 1+8 = 9 Final total: $18.99 Now if someone changes the tip to $4 or $5, the checksum fails.
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Replying to @aaronpk
Servers hate tips that aren’t round numbers because it makes it REALLY hard to cash out at the end of the night.
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I thought the credit card machines make you enter the final total of the receipt when you cash out the stack of paper receipts at the end of the night. It's been a while since I've done that myself tho...
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Replying to @aaronpk
I always thought I was the only one to do something like this...