dodgey school maths?

This was my sons in year 5 a couple of weeks ago

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What. There is no way a kid in year 5 should be expected to work that out. You need to know log functions at a bare minimum, which is like year 12 or something.
 
What. There is no way a kid in year 5 should be expected to work that out. You need to know log functions at a bare minimum, which is like year 12 or something.

Lol what?! Year 12? You don't need to know log functions at all.
Its keystage 2 maths.
 
What. There is no way a kid in year 5 should be expected to work that out. You need to know log functions at a bare minimum, which is like year 12 or something.

@Maccapacca didn't provide context but it just looks like it is asking you to add distances of like 1000, 10,000, 100,000 etc..

So for example answers could be:

517,453
527,453
537,453

It might be better if he provided the full question sheet though. Just a quick google of the national curriculum and "year 5" (presumably some year in junior school?) requires:

https://www.gov.uk/government/publi...programmes-of-study#year-5-programme-of-study

Pupils should be taught to:

  • read, write, order and compare numbers to at least 1,000,000 and determine the value of each digit
  • count forwards or backwards in steps of powers of 10 for any given number up to 1,000,000
  • interpret negative numbers in context, count forwards and backwards with positive and negative whole numbers, including through 0
  • round any number up to 1,000,000 to the nearest 10, 100, 1,000, 10,000 and 100,000
  • solve number problems and practical problems that involve all of the above
  • read Roman numerals to 1,000 (M) and recognise years written in Roman numeral
 
i don't see what it has to do with powers of 10 - its just 32,500km each step?

Nope - its just asking you to add powers of 10 - that is what the question asked, it didn't say anything about each step being equal.

The kid just needs to note that **7,453 doesn't change so the steps are either 10,000 or 100,000

any answer involving steps of either 10,000 or 100,000 where you've added 10,000 at least twice will work

Everyone is massively over thinking the question for that one!

Yup, though I suspect that if the poster had posted the full homework for context then you'd probably see other questions where the kid is asked to add or subtract say 100, 1000 etc..
 
that just sounds completely illogical - why would the distance be 10,000 one month but 100,000 another month?

Why not? It isn't a physics question, it is a junior school maths question presumably on a sheet of questions where the kids are being asked to add or subtract powers of 10.

Perhaps Captain Kirk decided to cruise along for a few months then wanted to go to warp 9 or whatever... it is rather irrelevant.

I mean you could also ask why was it traveling further and further away over several months in the first place? I mean current day space shuttles tend to have missions lasting days not months! But that has little to do with the question - it doesn't make the question illogical though.
 
I've just watched this video because I've never heard of this Counting in Powers of 10 before.


According to that all you have to do is add 10 on the end of each number so

March 507,453
April 507,463
May 507,473
June 507,483

Am I right?
 
Don't be nasty.

Watch that video, you just count up in 10s

I'm not being nasty - you haven't answered the question. I'm trying to illustrate what you've got wrong here.

How do you get to July from the answer you've given there? The figure for July is given in the question - adding 10 doesn't get you there! Have a look at the question again, I've given you some example answers in earlier posts. (I am being nice and assuming you're not trolling as this is junior school maths for 9-10 year olds!)

You've also completely misunderstood a video showing you how to count in steps of 10^1, 10^2 and 10^3.
 
I'm not being nasty - you haven't answered the question. I'm trying to illustrate what you've got wrong here.

How do you get to July from the answer you've given there? The figure for July is given in the question - adding 10 doesn't get you there! Have a look at the question again.

You've also completely misunderstood a video showing you how to count in steps of 10^1, 10^2 and 10^3.

Because the original question doesn't mention 10s powered by anything other than ^1
 
Because the original question doesn't mention 10s powered by anything other than ^1

The original question doesn't place any restriction there.

Why are you still ignoring the question I asked though? The answer you gave is obviously wrong - the question gives you a figure of 637,453km for July - how do you get there if you're only travelling 10km each step?

you said:

March 507,453
April 507,463
May 507,473
June 507,483

Am I right?

Well obviously you're not right as the next step is 637,453km - 507,483km = 129,970km.

Do you not see that that is incorrect?
 
I've just watched this video because I've never heard of this Counting in Powers of 10 before.


According to that all you have to do is add 10 on the end of each number so

March 507,453
April 507,463
May 507,473
June 507,483

Am I right?

this video goes far too fast, it's like the things you used to get at the end of programs (think Bad Influence had this) where you'd need to play them back and pause to read
1/10
 
Because the original question doesn't mention 10s powered by anything other than ^1

Because if you increased 10 each month and were at 507,483 in June, you'd have to increase by 129,970 to reach 637,453 in July, which isn't a power of 10.

Powers of 10 are 1, 10, 100, 1000, 10000, 100000 etc.
 
The original question doesn't place any restriction there.

Why are you still ignoring the question I asked though? The answer you gave is obviously wrong - the question gives you a figure of 637,453km for July - how do you get there if you're only travelling 10km each step?

you said:



Well obviously you're not right as the next step is 637,453km - 507,483km = 129,970km.

Do you not see that that is incorrect?

and 129,970 is still a multiple of 10s

It's like you can put whatever you want as long as it's a multiple of 10s.
I think it's an incorrectly worded question.
 
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