11 Plus Exams Forum

I had a total brain meltdown at the weekend. I am sleep deprived but can someone please help!

If you know that a percentage for a test is 60% and that the test is out of 15, say, how do you find out what the original score out of 15 was? Thank you I know I'm going to hit my head on the desk when someone gives the the answer!

0.6 x 15

Isn't it 60 divided by 100 (0.6) and then times by 15?

Answer = 9

Quick check is that 60% is more than half and 9 is more than half of 15...

At least, I think that's how you do it!!!

There should be a hand slapping forehead emoticon

Thank you both!

heehee

yoyo was quicker than me!!

I suppose it is important to explain it in a way that the child can understand though.

60% is 60/100 and you are wanting to turn it into ?/15

So, 60/100 = ?/15 --- equivalent fractions ---- would this work for your son?

and could he then say that this means that 60 x 15/100 = ?

And do some cancelling down to 6x15/10 = 6x 3/2 = 3x3 = 9?

Seems long-winded but it works for anything without having to make any leaps in the dark or remember anything other than meaning of fractions and percentages.

Yes, that's probably what he would do, Mystery. It was my own brain glue that I was struggling with! I haven't given him the paper yet - paper 17 Bond 10-11 book 1 - I try to look at the paper first so I can help him should he come unstuck. I'm feeling incredibly behind; I feel we should be finishing book 2 by now. Then ironing out weak points, ready to start on papers by Easter.

I don't think you should feel behind. That's a lot of ground you have covered in quite a short time. A close relative only did Bond 9-10 and got 140 in the Kent maths if that is any consolation.

I'm feeling very behind --- DD's maths has gone back to being very slow and careless again. Goodness knows how she manages to be one of the best at school - they must all be rubbish. They don't seem to do maths very often and when I ask what they've done it sounds like stuff they should have done years ago. All very odd.

I'm trying now to cut some corners as I don't think we are going to get time to do cover the syllabus, do Bond books and do the 8 GL familiarisation papers for maths as well as everything else in the other 3 subjects.

Please don't say 'cancelling down' - we are simplifying or looking for common factors.

Guest55 wrote:Please don't say 'cancelling down' - we are simplifying or looking for common factors.

Isn't that just another phrase that means the same thing?

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