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 Post subject: DECIMALS PERCENTAGES AND FRACTION, PLEASE HELP US??Posted: Thu Sep 13, 2007 8:12 pm
MY DAUGHTER AND I ARE WORKING THROUGH BOND 10 MIN TESTS I AM STUCK.

Can anyone help me with the following questions??

WHAT FRACTION OF 2 HOURS IS 15 MINUTES?

1/4, 1/2, 2/15, 1/8,1/3

HOW DID THEY GET 1/8

I UNDERSTAND 2 HOURS =120 MINS

SO FRACTION NOW BEING 15/120

SO I NEED TO CANCEL DOWN?? BY WHAT??

THIS QUESTION IS DOING MY HEAD IN

JANE SCORCES 17 OUT OF 25 IN A MATHS TEST.
WHAY PERCENTAGE DID SHE GET??

HOW DID THEY GET THIS??

ANOTHER ONE

WHICH OF THE FOLLOWING HAS THE LARGEST VALUE?
5/7, 71%, 0.69, 2/3, 65%

WHICH METHOD SHOULD I APPLY TO MAKE MY DAUGHTER UNDERSTAND.
CHANGE ALL TO DECIMALS??

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 Posted: Thu Sep 13, 2007 8:20 pm

Joined: Fri Jul 06, 2007 8:31 pm
Posts: 1245
HARP wrote:
WHAT FRACTION OF 2 HOURS IS 15 MINUTES?

1/4, 1/2, 2/15, 1/8,1/3

HOW DID THEY GET 1/8

4 lots of 15mins in 1 hr

therefore 8 lots of 15 mins in 2hrs

i.e. 1/8

HARP wrote:
JANE SCORCES 17 OUT OF 25 IN A MATHS TEST.
WHAY PERCENTAGE DID SHE GET??

Test is out of 25. But Percentage means out of 100.

25 x 4 = 100

So... 17 x 4 = 68

HARP wrote:
WHICH OF THE FOLLOWING HAS THE LARGEST VALUE?
5/7, 71%, 0.69, 2/3, 65%

Well 2/3 is 1/3 doubled... i know this is 0.66666
65% is 0.65
0.69 is 0.69
71% is 0.71

so we've got 0.71 as the max so far

Now... 5/7 looks tricky...

long division.. 0.71+a bit

So... 5/7

Only my attempts and i'm not a tutor just a parent
Regards
SVE

_________________
Animis opibusque parati

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 Post subject: Posted: Thu Sep 13, 2007 8:26 pm
hi

first question is 15/120 cancel by 5 = 3/24 now cancel by 3 =1/8

second question is 17/25x100/1, cancel by 25 so now 17/1x4/1 which then gives 17x4=68

hope this makes sense

off to look at other question!

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 Post subject: Posted: Thu Sep 13, 2007 8:43 pm

Joined: Wed Jan 11, 2006 7:10 pm
Posts: 8766
Location: Buckinghamshire
Hi HARP

Please try to avoid posting in capital letters in future - CAPS is "shouting" in the email/Forum world, and not considered to be polite.

CAPS is reserved for specific words that need maximum emphasis.

Sally-Anne - Forum Moderator

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 Post subject: Posted: Thu Sep 13, 2007 9:36 pm
I think you are overcomplicating the fraction of hours one. She'll know 15 mins is 1/4 of hour, so it will be 1/8 of double the time, that is two hours.

The comparison of amounts. Change them all into decimals. Get her to memorise 1/3 = 0.33 so 2/3 - 0.666666. The only one left to worry about is 5/7. That means 5 divided by 7 which is 0.716.... so that is the biggest.

Personally I like the 10 minute tests because it is a good way of giving them a daily dose of maths without being excessive. However, I think some of the questions are harder than you are going to encounter--this being one of them. None of my pupils or my daughter could manages this one. I am lucky because, when I see none of them managing them, I know it's not important that she can't.

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 Post subject: Posted: Fri Sep 14, 2007 7:38 am

Joined: Mon Jun 18, 2007 2:32 pm
Posts: 7140
Location: East Kent
If she is having difficulty converting fractions to decimals and vice versa, try googling fractions and decimals and games. There are lots of good games to help her understand. I think bbc has some.

I'll nip off around teh web and see if anything else pops up....

first question ...I did it by 15 mins is a 1/4 of an hour

2 hours is twice 1 hour
15 mins is 1/8 of 2 hours

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 Post subject: crystal clear thanksPosted: Fri Sep 14, 2007 8:54 am
Thankyou very much for all your replies, it's all crystal clear.
So easy.
So simple
just need to use common sense.

I'm beginning to enjoy maths now.

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 Post subject: Posted: Fri Sep 14, 2007 9:05 am

Joined: Mon Jun 18, 2007 2:32 pm
Posts: 7140
Location: East Kent
try this site for starters
http://gamequarium.com/math.htm

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