Should I be worried or is it likely to be a mistake?

[Somewhereoverthesanddune]

DD is in Y3 and has just started a new school (relevant as I don't know the general level of the class in maths). She's come home with a homework worksheet that is add 10, 100 and 1000 to various numbers and then subrtravt 10, 100 and 1000 from various numbers. All fine except some of the subtraction results in negative numbers (eg 478 - 1000).

Is it likely the teacher just didn't read the worksheet well enough or is this something many schools will have covered in year 3? They don't set for maths and as far as I can see the same worksheet has gone to everyone and these Q's are just in the middle of all the other ones so it doesn't feel like an extension activity.

Just wondering if I'm going to need to tutor her in maths to catch up as she hadn't done anything of the level of negative numbers in her last school. I don't remember doing negative numbers until secondary!

I would assume it's a mistake. I'm a Y4 teacher and am just introducing my class to negative numbers to -10 this week. It was most likely printed off quickly and not checked thoroughly.

Y3 teacher here. The curriculum at this stage is place value of 3 digit numbers. We are doing +/- 1, 10 and 100 to 3 digit numbers so taking away 1000 is more difficult than required. Also, negative numbers will be very limited at the moment and would certainly not be going up to -478, so I'd say it's a mistake.

Thanks everyone. The whole year got the same worksheet so I'm pretty certain someone else will point it out. It is sloppy (and in my view indicates pointless homework because I spotted the issue from a quick scan of the worksheet and so I assume whoever set it hadn't bothered to read it) but unless it becomes a consistent issue I'd prefer to save chats with the teacher for real problems. It's very obvious my DD is lacking confidence in maths so I'd prefer to leave it to the teacher to figure that out and discuss at parents evening. I love the fact the new school doesn't set as being top set before just saw kids with very strong mental maths only and so felt she was behind.