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Do schools teach (long) subtraction like this?

34 replies

MissusMaker · 21/04/2020 19:51

DS is in year 2. I'm mostly consolidating his maths knowledge at the moment, using various worksheets/apps etc but sometimes we come across a new concept and I'm not sure if I'm teaching it in the right way... in this case we are talking about subtraction. He can do a subtraction such as say 55-22 by lining up the tens and ones, subtracting the ones column and then the tens column - he knew how to do this already. But then we came across problems such as 55 - 27 and I've been teaching him the way I was taught - you take from the tens column, reduce it by one and then add 'ten' to the ones column - so hard to explain but like this picture that I've just stolen off the net - is this how it's still taught?

Do schools teach (long) subtraction like this?
OP posts:
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MissusMaker · 03/05/2020 21:39

Popping back on to say we've not had any issues teaching it this way. DS is now looking at money so we spend some time using coins to represent the sums too. I made him start with a £1 coin, we discussed that that is 100p, then he would exchange it for 10 x10p and I'd make him stop and ask how much money he has 'now' so he would confirm he still had 100p and then exchange one of the 10p for 10 x 1p and again id ask him how much he has now to confirm he understands he still has 100p in different format. Then he took away however much and counted up what was left - and we double checked using column subtraction whilst also discussing the coins. Seemed to work well. This week we need to do the same thing but using different amounts to start, starting with 87p and taking away 29p or whatever. Anyway all good here Smile

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Pokemontrainer · 03/05/2020 22:03

How do schools deal with zeros in long subtraction though ?

Pokemontrainer · 03/05/2020 22:04

How would a kid set out

102
-56

My dc is confused with zeros and 9s in London subtraction

Eeeekim40thisyear · 03/05/2020 22:16

My stepchild (year 8) is struggling with times table - he doesn't know it off by heart, can't tell the time on an analogue clock. He struggled to work out a simple £1.56 x 48 sum the other week. Is there a simple way for us to help him? I worry that all this time out of school will impact his learning - we try to help him as best we can but resident parent doesn't encourage or enforce he does any school work there.

Pokemontrainer · 03/05/2020 23:50

Get work sheets and go through them with him step by step - topic by topic.

Ask teachers to provide or have a search there are loads of free stuff at the moment.

Have a look at you tube even yay maths or other maths topics and go from there

Make it fun

Or see if there a bright local kid who wants to teach by Skype for a reasonable amount of cash - this has really helped my child.

MissusMaker · 04/05/2020 13:09

@Pokemontrainer I've written your sum - hopefully it's clean, I've done it in stages:

Do schools teach (long) subtraction like this?
Do schools teach (long) subtraction like this?
OP posts:
MissusMaker · 04/05/2020 13:09

Obvs I meant clear, not clean. It's not particularly clean because I've used scrap paperGrin

OP posts:
modgepodge · 04/05/2020 18:32

Pokemon trainer

Set out in columns with units lined up.
Establish you can’t do 2-6 in the units. Look in tens column to exchange - there’s a 0., so, go to 100 column. Take 1 away from here (leaving 0 hundreds) and put it next to the 0 on the tens column, giving 10. Then, cross out the 10 to make 9, and take the one from here and put it next to the units to give 12. Can then subtract in units and tens columns.

Pokemontrainer · 04/05/2020 22:54

modgepodge missusmaker

You are both so wonderful thank you.

I don't know why he gets nervous with the zeros.

I may send you some more if I get stuck.

I also don't know why I am having issues with it.

I want to hug you both Smile

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