In which year is column subtraction (with carrying) of 3+ digits normally taught?

[Iamnotminterested]

Thankyou in anticipation!

Thanks for all the replies, makes interesting reading to see the difference between schools/years WRT methods.

I have another question for teachers too. DD came home yesterday to say they had been dividing using a number line, and she showed me 25/5 this way; I said but you know what 25/5 is, have done for years, knows what it means etc etc and she said yes but I had to do it this way because that is what we are doing in class
Now, someone please tell me the rationale behind this for a child who knows X tables and inverse very well, understands place value completely according to her teacher and can divide happily using the bus stop method to large numbers? AFL - ????? in this case. Do I bide my time and hope that the lesson was an introduction to other methods of division or say something? The thing is she will not speak up in class as she is a good girl who is impeccably behaved at school. WWYD??

DS doing in yr3 - he is about average. So glad they started it - he finds it much easier than all the number line bollox

DS being doing that for a while. He is 7 and alarmingly good with numbers.

Ability of the individual child really affects when this is taught. DD was taught this in year 1 due to her ability. She currently uses a wide variety of tactics including columns, chunking comes in very useful when doing rapid fire mental arithmetic as it enables you to accurately estimate the answer.

Iamnot, I reckon it was an introduction. They usually start with very easy sums when learning a new method, then once they're sure they've grasped that, they can use the same method for more complicated calculations. Bet mrz will have a view.

smee I hope so too! Will sit tight for now.

decomposition? bloody hell, what is that. Then again maths is not my best area.

sorry actually read the post, i know what it means, even know how to do it, just did not realise it was named as such

My dd y3 uses the carrying method at home and partitioning at school, she seems to prefer carrying though

Iamnotminterested

I have a real life situation where division on a number line works, and it happened today in fact!

Each week when we go swimming, I give the children 5 minutes to get changed. I started the timer on my phone and forgot to stop it. When I checked it today, it was on 1176 hours!

I gave my class the option of working out how many weeks this is, having already found that one week is 168 hours. They used repeated subtraction to solve it, ie 1176 - 168 - 168 - 168 - 168 - 168 - 168- 168 = 0, therefore 7 weeks.

So yes, 25 / 5 is 5, but could she work out 1176 / 168? Not that it comes up frequently, but my year 3s managed it!