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Maths problem - help!

(32 Posts)
Mishap Wed 14-May-14 10:07:46

My DD is constructing a mandala which needs to have 120 individual (equal-sized) circles within a 3 metre diameter circle. I have found on the net an illustration of an arrangement of the circles that fits, but it does not say what size these small circles need to be.

Any maths wizards out there!!??

Sorry to tax your brains on this lovely sunny day.

Rowantree Thu 15-May-14 11:59:43

I didn't. But then I've never been able to 'do' Maths. I have the mathematical equivalent of dyslexia. DD2 has it too. It's been a struggle to understand anything mathematical! I don't think I'd get far with any KS2 paper blush
and I've always felt totally stupid because of my lack of understanding. My brothers teased me constantly about it and I was the butt of all the 'dimwit' jokes in the family.
I vowed I'd never do the same to my children, but I did help DD2 as much as possible and she gets by....as do I!

apricot Wed 14-May-14 20:23:22

Ye gods I can't do any of these.
I'm just booking hotels and travel for a short jaunt with a friend and every single time I add up and divide by 2, I get a different answer. Numbers are EVIL.

MiceElf Wed 14-May-14 19:58:59

You surely remember Chris Woidhead being unable to multiply a half by a third.

Mamie Wed 14-May-14 19:53:00

For KS2 tomorrow is the last day, Anno.

MiceElf Wed 14-May-14 19:52:47

I'm not saying it's hard. I'm asking how many adults in the general population could solve it. Quickly.

annodomini Wed 14-May-14 19:48:38

It's not really all that hard, Mice, unless I have my reasoning completely wrong!

Ana Wed 14-May-14 19:48:15

I found that question easy.

annodomini Wed 14-May-14 19:46:46

My GD is also doing SATs this week. I think today is the last of them.

Mamie Wed 14-May-14 19:36:27

My GD has been doing her KS2 maths today. I think she thought the mental maths paper was hard, but the second paper was OK.

MiceElf Wed 14-May-14 19:23:08

Just had sight of the KS2 Maths paper for 10/11 year olds

n stands for a whole number

2n is greater than 30
5n is less than 100

Write all numbers that n stands for

I wonder how many adults could tackle that one with ease?

grumppa Wed 14-May-14 19:10:47

Of course, phoenix! But 42 what? Are zaphods a useful unit of measurement in this context?

Anne58 Wed 14-May-14 18:58:06

As evry fule nose, the answer is ...........42.

grumppa Wed 14-May-14 18:54:40

120 circles with a radius of 137mm. would have a total area equal to that of the proposed circle containing them, but thus makes no allowance for the spaces between the small circles, so they would have to be significantly smaller.

Hmm.

Ana Wed 14-May-14 18:49:23

(But not necessarily x 8!)

Mishap Wed 14-May-14 18:41:02

No - they do not overlap; and there needs to be a small space between each. I have come to the conclusion that circles of about 20cm would fit the bill.

As they say in a GCSE exam, could you please show your working Roderick.

Ana Wed 14-May-14 18:33:58

If they overlapped, Jess, that would be a whole new ballgame! grin

Anne58 Wed 14-May-14 18:00:59

Roderick take your finger off that button immediately!

Brendawymms Wed 14-May-14 17:58:10

My picture in my mind of a mandala would have a circle touching the outer circle at every three degrees but what do I know!

JessM Wed 14-May-14 17:37:01

do they overlap?

Roderick Wed 14-May-14 16:58:39

Yes about 140 or 137 to be exact

Roderick Wed 14-May-14 16:58:39

Yes about 140 or 137 to be exact

Roderick Wed 14-May-14 16:58:39

Yes about 140 or 137 to be exact

Roderick Wed 14-May-14 16:58:39

Yes about 140 or 137 to be exact

Roderick Wed 14-May-14 16:58:39

Yes about 140 or 137 to be exact

Roderick Wed 14-May-14 16:58:37

Yes about 140 or 137 to be exact