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A childhood belief about counting

When I was first learning subtraction with two-digit numbers, we were told that to subtract a big digit from a little digit, you have to "borrow a one" from the tens place, which of course reduced the digit in the tens place by one. All true.

The problem was that I had been told very clearly as a child that when you GIVE something you get to keep it, but when you BORROW something, you have to give it back -- it isn't really yours. When the teacher completed the problem on the blackboard, I asked her when we were going to give the one back. She looked at me as if I was crazy, and said that you don't give it back.

I found this rather disturbing, and from that day to this I have always thought that subtraction was mean and unfair.

— Ernest

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