Aaargh typo in DD's homework!

[Clary]

Apparently her class have been working on "sorting shapes and numbers according to different criteria's".

Yes really and with the apostrophe too.

Now I am all for saying of a newsletter eg "well it was probably put together by the secretary" etc, but this beats that.

Clearly a worksheet put together by the maths teacher, who I don't rate particularly (she allowed DS1 to just piffle his way thru yr 5) but at least I imagined she could spell.

[Clary]

Hah! Whom I don't rate of course.

[crisproll2]

Correct it, send it back. Job done.

[Clary]

I have corrected it but I felt a bit bad about it.

I'm just aghast that a primary teacher thinks you need apostrophes in plurals. Never mind that she seems unaware that criteria is already a plural.

Just having a moan I suppose.

[crisproll2]

That's what MN is for! Perhaps the teacher doesn't always do this and was having a bad day? I absolutely agree with you that teachers should be able to spell and use the correct form for plurals but they are human and do make mistakes.

[Clary]

yy if course, prob just a bad day for her

[crisproll2]

Am sure you mean of course.

Job done!

[Anenome]

It could have been due to tiredness...they have a lot to do. I know my own work is not always perfect.

[kat2504]

yep criteria, already a plural. Singular form criterion.
But everyone makes mistakes! Criteria/criterion is not the most commmon plural in the world so understandable to get it wrong. Apostrophe a bit rubbish though. But everyone makes the odd error. I did a major adding up error on a worksheet I created today. Extension task - spot the deliberate mistake I made.... Was due to time pressure, only had half an hour to do the job, didn't check thoroughly enough.
Any time I make a worksheet involving left and right I make at least one mistake as I am so uncoordinated!