The Student Room Group
Competition - post a photo you've taken of nature >>
Competition - post a photo you've taken of nature >>
Competition - post a photo you've taken of nature >>

Work out 0.17 x 6000 - confused?

So i just revised this topic and i thought you would have to do 17 x 6000 which is 102000 and then add the decimal point before the last 0 because the dp is after the first digit in the question but in the mark scheme it simply says 1020??? But that would only be if you did 17 x 60 but the question is saying 6000??

Scroll to see replies

Reply 1
Avatar for Fk90709
Fk90709
3
Instructions weren’t clear, house burned down.
Original post by Fk90709
Instructions weren’t clear, house burned down.


Lol I’m sorry what are you saying
Reply 3
Avatar for Fk90709
Fk90709
3
Original post by Jheinexx
Lol I’m sorry what are you saying


Im as confused as you.
Original post by Fk90709
Im as confused as you.


Confused by how i explained it or confused by how i got my answer or by the real answer?
17 x 60
1.7 x 600
0.17 x 6000
Reply 6
Avatar for B_9710
B_9710
18
Well 0.17=17/100 so 0.17x6000=(17/100)x6000=(17x6000)/100.
You're out by a factor of 10 basically but I'm dying to give you the intuition of why you divide by 10 or 100 or whatever in general.
Hope this helps
0.17×6000
1.7×600
17×60
(edited 6 years ago)
Original post by Notoriety
17 x 60
1.7 x 600
0.17 x 6000


But why 17 x 60 when it clearly says 6000
Original post by B_9710
Well 0.17=17/100 so 0.17x6000=(17/100)x6000=(17x6000)/100.
You're out by a factor of 10 basically but I'm dying to give you the intuition of why you divide by 10 or 100 or whatever in general.
Hope this helps


No idea what you just said:/
Buttt why would it be 17 x 60 when it says 6000
Reply 11
Avatar for B_9710
B_9710
18
Original post by Jheinexx
No idea what you just said:/


What's your reasoning for dividing by 10 after you do 17x6000?
Maybe if you see that 0.17x6000=(0.1+0.07)x6000 then you can expand so it's just (0.1x6000)+(0.07x6000) I don't knos if this make sense to you or makes it any easier or whether you find that just as confusing.
(edited 6 years ago)
Original post by B_9710
What's your reasoning for dividing by 10 after you do 17x6000?


I don’t divide by 10. I do 17 x 6000 = 102000 then add the dp before the last 0 making it 10200.0
Original post by Jheinexx
Buttt why would it be 17 x 60 when it says 6000


Because
when you move the decimal point in 0.17 you're timesing that by 10. So you need to divide by 10 on 6000.
So if you've times'ed by 10 and divided by 10 ik the same equation, it's likw you've made no changes.

so... 0.05 ×1000
is the same as 0.5 ×100
or the same as 5 × 10

Does that make sense?
Please no negative numbers. I want the simplest way
Original post by Jheinexx
I don’t divide by 10. I do 17 x 6000 = 102000 then add the dp before the last 0 making it 10200.0


But it's 0.17 so theres decimal point needs to move twice. so 1020.00
if it was 01.7 then you'd move it once so then it'd be what you got, 10200.0
(edited 6 years ago)
Reply 16
Avatar for B_9710
B_9710
18
Original post by Jheinexx
I don’t divide by 10. I do 17 x 6000 = 102000 then add the dp before the last 0 making it 10200.0


Ok by putting the decimal point where you do you are in fact just dividing by 10 essentially - maybe without realising it. The key thing here though is that you have to divide by 100 so the decimal point moves two places to the left not one.
Original post by Jheinexx
I don’t divide by 10. I do 17 x 6000 = 102000 then add the dp before the last 0 making it 10200.0

not before the last zero, before the last 2 zeros
bc there are 2 digits after the decimal place in 0.17, you move the decimal place twice when putting it back in
if it were 0.6 for example, there is only one number after the decimal place, you youd only only move the decimal by one place when putting it back in
Original post by YouAreAYute
not before the last zero, before the last 2 zeros
bc there are 2 digits after the decimal place in 0.17, you move the decimal place twice when putting it back in
if it were 0.6 for example, there is only one number after the decimal place, you youd only only move the decimal by one place when putting it back in


Oohhh lmao you explained it well. Thanks
Original post by starfab
But it's 0.17 so theres decimal point needs to move twice. so 1020.00
if it was 01.7 then you'd move it once so then it'd be what you got, 10200.0


Original post by B_9710
Ok by putting the decimal point where you do you are in fact just dividing by 10 essentially - maybe without realising it. The key thing here though is that you have to divide by 100 so the decimal point moves two places to the left not one.



Okay thanks guys my dumbass self got it

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you