Deliberate column subtraction mistakes

A worksheet with a set of 8 column subtraction calculations, each with a different deliberate mistake (all except number 5, which is correct).

I searched the internet for something like this and couldn’t find one. So I had to make it.

It’s a PDF, I’m afraid, since it was easier for me to write them out by hand than work out how to do it on a computer.

There is now an answer sheet.