What do you do? I'm not talking the odd typo but getting facts wrong. This week my kids have been told that a rhombus has no lines of symmetry, had arithmetic tests with incorrect answers (a weekly occurence) and this morning that there are three types of formal conjunction 'and, but and CASUAL' (this last should be causal). The teacher pronounces it 'casual' through the lesson too, so it's not just a typo. I private messaged her to let her know in a friendly way and have had rather a snotty reply. I know they are overworked and under appreciated blah blah but surely they should be checking what they are doing? I wouldn't get away with constant errors in my profession.