DECIMALS PERCENTAGES AND FRACTION, PLEASE HELP US??

[HARP]

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??

ANSWER IS 68%
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??

PLEASE HELP ME AS WERE BOTH VERY CONFUSED.

[SunlampVexesEel]

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

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

ANSWER IS 68%

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

25 x 4 = 100

So... 17 x 4 = 68

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

[0505]

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!

[Sally-Anne]

Hi HARP

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[Guest]

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.

[yoyo123]

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

[harp]

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.

[yoyo123]

try this site for starters
http://gamequarium.com/math.htm