2nd Grade Math's Question

Paddycrumlinman

Lads,

Need help. I'm normally pretty handy at Math's and I cannot get my head around or explain to my 7 year old how to answer this Math's question.

So here you go folks.... answers on a post card please...

Write the 3-digit number that matches the clues. My number has as many hundreds as ones. It has 5 tens. The sum of its digits is 13


Easy explanation anyone. If its the wrong forum please move.

Thanks.

bleg

42

Peyton Manning

454

google faps

157.

thank you.
Come gain.

Captain Chaos

157

anniehoo

139...no idea why

TheZohanS

http://tinyurl.com/2frfqdf

alwaysadub

Why is your 7yr old doing his maths homework in the middle of the night?

google faps

alwaysadub wrote: »

Why is your 7yr old doing his maths homework in the middle of the night?

Because you've got his timezone workbook.


Could also be 58, btw.

Gamer2010

tis around 8pm in Florida

AskMyChocolate

It's 454 chief.

alwaysadub

Ah ok,i'm on the mobile,didn't see the location,was going by username!

google faps

AskMyChocolate wrote: »

It's 454 chief.

There are 45 tens in 454.

ibarelycare

google faps wrote: »

Because you've got his timezone workbook.


Could also be 58, btw.

The only solution is 454. It's a 3-digit number and there are as many hundreds as ones, and we know the middle number is 5.

google faps

ibarelycare wrote: »

The only solution is 454. It's a 3-digit number and there are as many hundreds as ones, and we know the middle number is 5.

058 then or 58.0

Podge_irl

Paddycrumlinman wrote: »

Lads,

Need help. I'm normally pretty handy at Math's and I cannot get my head around or explain to my 7 year old how to answer this Math's question.

So here you go folks.... answers on a post card please...

Write the 3-digit number that matches the clues. My number has as many hundreds as ones. It has 5 tens. The sum of its digits is 13


Easy explanation anyone. If its the wrong forum please move.

Thanks.

If it has 5 tens then the other two digits must add up to (13-5) = 8. They're the same digit so 8/2 = 4. So 454.

ibarelycare

google faps wrote: »

058 then or 58.0

There's still not as many hundreds as ones in those!

Captain Chaos

ibarelycare wrote: »

The only solution is 454. It's a 3-digit number and there are as many hundreds as ones, and we know the middle number is 5.

The same can be argued for 157. Both are valid.

Unless you take the meaning of "ones" as in the unit "ones" as used on an abacus, in which case 454 is correct. But ones in the literal sense both are correct.

Podge_irl

Captain Chaos wrote: »

The same can be argued for 157. Both are valid.

Unless you take the meaning of "ones" as in the unit "ones" as used on an abacus, in which case 454 is correct. But ones in the literal sense both are correct.

I didn't actually notice that interpretation, but in the context of the question only 454 is valid.

dubtom

Well even if the answer is 454,I still don't how yis did it. Is homework like that some sort of abuse?

ibarelycare

Captain Chaos wrote: »

The same can be argued for 157. Both are valid.

Unless you take the meaning of "ones" as in the unit "ones" as used on an abacus, in which case 454 is correct. But ones in the literal sense both are correct.

Oh yeah, see what you mean. I took it to mean the units.

alwaysadub

Seriously,they expect a 7 year old to understand this?! I'm 4 times that, and i'm confused

jiltloop

Thats a riddle not a maths question!

AskMyChocolate

dubtom wrote: »

Well even if the answer is 454,I still don't how yis did it. Is homework like that some sort of abuse?

We know the number is of the form X5X. We know that X+5+X = 13. Therefore 2X + 5 = 13. 2X = 8. X = 4.

Three digit number = 454.

jiltloop

alwaysadub wrote: »

Seriously,they expect a 7 year old to understand this?! I'm 4 times that, and i'm confused

Haha I saw your post before the edit, may your maths needs brushing up anyway!

alwaysadub

jiltloop wrote: »

Haha I saw your post before the edit, may your maths needs brushing up anyway!

Ssh!
I was just getting carried away with how old i actually want to be,rather than how old i actually am :pac:

And yeah,my maths is crap!

davyjose

alwaysadub wrote: »

Seriously,they expect a 7 year old to understand this?! I'm 4 times that, and i'm confused

You're 47?

dubtom

AskMyChocolate wrote: »

We know the number is of the form X5X. We know that X+5+X = 13. Therefore 2X + 5 = 13. 2X = 8. X = 4.

Three digit number = 454.

Ehh,thing.

alwaysadub

davyjose wrote: »

You're 47?

:eek:
I am not! I said i was 4 times his age!

Technically i'm 4 times his age, plus a bit. But we won't worry bout that

Posy

So 4 times 7 is.. umm.. God, I hate feckin' maths.

areu4real?

157

I think this needs a poll

google faps

My first is in jigs but not in reels...
etc.

DOC09UNAM

Obviously 454

I dont see why 157 is even being entertained.

COUCH WARRIOR

areu4real? wrote: »

157

I think this needs a poll

no need for a poll, 157 is incorrect, because your interpretion of the meaning of "ones" is inconsistant with the usage of "tens" and "hundreds"

DamienH

It's seven year old maths, not some cryptic clue! It's a step up from counting milk bottle tops and calling them units. Answer is 454.

Kasabian

Take your kid out of that school for heaven's sake, send him to military , law or clown school he won't need math.

Dampsquid

Only answer could be 454. The amount of wrong answers on this thread is worrying.

danniemcq

157

As many hundreds as ones = 1
5 tens = 50 so that gives us 15X
Sum of digits is 13 so 13-5-1=7 therefore answer is 157

It CANNOT i repeat CANNOT be 454 as there would be 4 hundreds in that and there aren’t 4 ones.

bonerm

danniemcq wrote: »

157

As many hundreds as ones = 1
5 tens = 50 so that gives us 15X
Sum of digits is 13 so 13-5-1=7 therefore answer is 157

I'd be delighted if this was the correct answer as I've read your post three times now and I don't know what the hell you're talking about.

pickarooney

danniemcq wrote: »

157

As many hundreds as ones = 1
5 tens = 50 so that gives us 15X
Sum of digits is 13 so 13-5-1=7 therefore answer is 157

It CANNOT i repeat CANNOT be 454 as there would be 4 hundreds in that and there aren’t 4 ones.

What on earth is this crap? None of that makes any sense.

Irish Halo

danniemcq wrote: »

157

As many hundreds as ones = 1
5 tens = 50 so that gives us 15X
Sum of digits is 13 so 13-5-1=7 therefore answer is 157

It CANNOT i repeat CANNOT be 454 as there would be 4 hundreds in that and there aren’t 4 ones.

I have never laughed harder at what almost looks like a reasoned explanation but on actually reading is nonsense.

The textbook is using a system like an abacus which is how a 7 year old would be doing maths with numbers in different "columns"; ones, tens, hundreds, thousands etc so 157 has 7 ones, 5 tens and 1 hundred.

As previously explained we are told that the number has three digits i.e. XYZ, We are told that the number in the hundreds place is the same as the number in the "ones" place i.e. XYX. We are then told that the number in the tens place is 5 so we now have X5X. The final clue is that X+5+X = 13
Therefore:
X+X = 13 - 5
X+X = 8
What number added to itself is equal to 8? 4.
The answer is then 454. 4 Hundred, 5 tens and 4 ones which satisfies all of our requirements

I agree with dampsquid

danniemcq

pickarooney wrote: »

What on earth is this crap? None of that makes any sense.

It makes perfect sense,

it’s a 3 digit number.

If it has 5 tens then that means there is a 50 somewhere in there. Ie the middle as that deals with tens. (Remember HUNDREDS-TENS-ONES) so now we have X5X where X is the numbers we still need.

So if there are as many hundreds as ones in this number you have to have 1 and 1 only (if it were 4 then you would end up with 11411 or something ridiculous as this is the only way to have 4 hundreds and 4 ones).

Its simple then to discover that if the first digit is 1 and the second 5 then the last HAS to be 7.

The bit that is confusing everyone is the way the “As many hundreds as ones”.

Pookah

4 hundreds, 5 tens, 4 ones = 454 (5 tens, as many hundreds as ones)

4 + 5 + 4 = 13

danniemcq

what about the "as many hundreds as ones though"?

pickarooney

danniemcq wrote: »

The bit that is confusing everyone is the way the “As many hundreds as ones”.

I think the only person it's confusing is you... under what branch of logic is 7 (the number of ones) as many as 1?

I assume you're ignoring the millenia-old abacus categorisation of units, tens, hundreds, thousands for some arcane reason, but can you explain what exactly you're using to replace it? Up to now you haven't given any explanation for where you got the 7 from.

Irish Halo

danniemcq wrote: »

what about the "as many hundreds as ones though"?

WHAT?

454 is 4 hundreds 5 tens and 4 ones therefore there are as many hundreds as ones i.e. 4

You're purposefully being obtuse right?

phill106

I am happy that it took me only seconds to solve this 7 year old math question. What were the rest of you doing for 7 years? Pfft! :P













Ps also worried about number of people getting this wrong. Did none of you learn how large numbers are made up?


As an example, the number 123 would consist of 1 hundred, 2 tens and 3 ones.

Stercus Accidit

454 - De rezt ov U shud get lessonz LOL

NothingMan

danniemcq wrote: »

what about the "as many hundreds as ones though"?

Don't think of the whole number. Think of the columns. first column is hundreds column = 4, middle column = tens column = 5, third column is ones column = 4.

So hundreds and ones column are both 4. So that satisfies that part of the question. It's all about thinking in decimal and not in real devisable numbers.

pickarooney

areu4real? wrote: »

157

I think this needs a poll

Wait wait... there's more than one person who has come up with 157. Please, for the laugh, can you explain how you both managed to dream up the same insane answer?

orourkeda

My question is who goes to second grade and not second class.