Tutors CD Vol2 Test 2

11 Plus Maths – Preparation and Information

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yoyo123
Posts: 8099
Joined: Mon Jun 18, 2007 3:32 pm
Location: East Kent

Tutors CD Vol2 Test 2 can you help??

Post by yoyo123 »

I am obviously missing something but can you help me clarify teh answer to Q47.

Susan drew an isosceles triangle with angles A B and C.

Angle A measured 70 degrees
Angle A and B have a difference of 30 degrees.

Give angle C



Answer is 40 degrees.


My working out was this...

Isosceles triangle has 2 angles the same.
Angles in a triangle add up to 180.

If A & B differ by 30 degrees (making B 40) then angle C must be 70.

If A & B different then C must equal A or B.

70 +70 +40=180

70 +40+40 =150.

so Angle A & C must be equal C=70 degrees.



I am now officially confused so can anyone shed some light on this for me.
If I can;t understand then how can I eplain it.. :oops:
Guest55
Posts: 16254
Joined: Mon Feb 12, 2007 2:21 pm

Post by Guest55 »

An isosceles triangle has two equal angles - from the given information A and B cannot be the equal angles.

Does A=C work? Yes it fits the info so go no further.
yoyo123
Posts: 8099
Joined: Mon Jun 18, 2007 3:32 pm
Location: East Kent

Post by yoyo123 »

:oops: :oops:

I told you my brain wasn;t in gear.

We had the right answer all along.

Today is one of those days!!

Thanks for your help.
Guest55
Posts: 16254
Joined: Mon Feb 12, 2007 2:21 pm

Post by Guest55 »

Post Bank-holiday brain fade .... don't worry about it :lol:
Mike
Posts: 625
Joined: Thu Jan 12, 2006 4:29 pm

Post by Mike »

Hi yoyo123

On a scale of 1-10, how good was the question?

Regards

Mike
Mike Edwards is a co-author of The Tutors product range.
yoyo123
Posts: 8099
Joined: Mon Jun 18, 2007 3:32 pm
Location: East Kent

Post by yoyo123 »

it was a good question , teased out a lot of knowledge.

Going over with a pupil and either getting them to explain how they came by answer, or working through it with them would also be valuable.


I'd give it 8!
(even with post holiday brain)
Mike
Posts: 625
Joined: Thu Jan 12, 2006 4:29 pm

Post by Mike »

Hi yoyo

I'm surprised G55 did not spot that 8! is outside the range.

8! is 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 = 40320

I didn't think it was that good.

Regards

Mike
Mike Edwards is a co-author of The Tutors product range.
Guest55
Posts: 16254
Joined: Mon Feb 12, 2007 2:21 pm

Post by Guest55 »

Perhaps because I've been working and not on-line ...
yoyo123
Posts: 8099
Joined: Mon Jun 18, 2007 3:32 pm
Location: East Kent

Post by yoyo123 »

I wrote it with my literacy head and not my maths head!!

it is worth an eight exclamation Mike, good but not as good as eight factorial.
Mike
Posts: 625
Joined: Thu Jan 12, 2006 4:29 pm

Post by Mike »

Hi yoyo

I appreciate that 8! was outside the range given.

However 8 out of 10 is also incorrect.

The answer is 10 out of 10. The question was rhetorical!!!

For Maths 11+ multiple-choice tests set by NFER it would not be possible to improve on the question, therefore it is a perfect question.

Hi G55

What is work?

Work is a series of events for which you receive no pleasure and for which you are paid at a far lower rate than what you are actually worth.

Haven't you been "indulging in your vocation" where the pleasure you attain far outweighs the renumeration you receive?

Regards

Mike
Mike Edwards is a co-author of The Tutors product range.
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