How to stop making silly errors.?
When I do math, 95% of my mistakes are just really silly mistakes. Like putting 7+6=12 Instead of 7+6=13, I just keep making these little errors in simple arithmetic or writing down a problem wrong. Just really stupid mistakes. On my last exam, I got an 80%, and out of the 20% I got wrong, only one of those problems was a real mistake. (x+7)^3 but I distributed the 3... The rest were these silly errors. My teacher saw this, but could only give me half credit for the other problems.
Well, how do I stop making these mistakes?