RecycleDiva said "I'm not certain whether a link to another story wasn't included in your comment. I'd be very interested to have a clarification of what you were commenting on because it sounds interesting. Thanks. "
First, this is a sample of practice for counting money. It is usually used by accountants or bank staff to improve work efficiency in China.
If u have $10000 cash,each of $20,We need to multiply, not add.
$20*500=$10000 (Too fast)
If use add,20+20+20(Too slow)