Slightly shocked that DDs year one teacher wrote in the year 1 newsletter "in math's we have been...." surely maths does not have an apostrophe - slightly worrying that someone who is teaching my daughter grammar isn't aware of basic rules herself.
Is this common (ie primary teachers making grammatical mistakes? Do I mention it at parent's night on Tuesday? DH joked that I should send it back to school with DDs homework on Monday with red circle around the mistake!