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 Post subject: Help with an IPS question...Posted: Mon May 03, 2010 3:51 pm

Joined: Thu Nov 12, 2009 1:36 pm
Posts: 192
Location: East Kent
....OK it's my turn for needing help (with the potential for completely embarrasing myself when the answer is obvious ) - I just can't understand it. Good job its DD doing the 11+ not me!

IPS Daily Practice Book 1, test 3.

Find the missing number in the third group

(24 [2] 6)
(35 [3] 7)
(48 [_] 6)

The answer is 6 but I don't understand why!

Many thanks

Dottie

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 Post subject: Posted: Mon May 03, 2010 3:58 pm

Joined: Mon May 18, 2009 8:21 am
Posts: 26
Location: Gloucestershire
2 + 2 =4 x 6 = 24
3 + 2 =5 x 7 = 35
6 +2 = 8 x 6 = 48

So add 2 to middle number then times by last number to give first number

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 Post subject: Posted: Mon May 03, 2010 4:53 pm

Joined: Fri Nov 17, 2006 8:54 pm
Posts: 1770
Location: caversham
The rule is to use the two outside numbers to make the middle number.

We have been struggling with some of these as it involves trial and error, so after a bit of brainstorming.

24 - (2*6) = 12 / 6 = 2

35 - (2*7) = 21 / 7 = 3

so

48 - (2*6) = 36 / 6 = 6

Hope that is as hard as it gets!

steve

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 Post subject: Posted: Mon May 03, 2010 5:24 pm

Joined: Tue Jan 22, 2008 6:36 pm
Posts: 188
Location: High Wycombe
As Patricia would say "if the number in the middle is smaller than the number on the outside then you are looking at dividing or minusing".
I think this one is a bit simpler than you are thinking.

With this one look at the two outside numbers
24 divided by 6 = 4, then take away 2
35 divided by 7 = 5, then take away 2 again

Apply this rule to the third
48 divided by 6 = 8, then take away 2 gives you the answer 6.

Hope this helps.

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 Post subject: Posted: Mon May 03, 2010 6:27 pm

Joined: Fri Nov 17, 2006 8:54 pm
Posts: 1770
Location: caversham
Quote:
I think this one is a bit simpler than you are thinking

Yep, shall I compound my error by admitting I looked at that solution and failed?

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 Post subject: Posted: Tue May 04, 2010 6:51 am

Joined: Tue Jan 22, 2008 6:36 pm
Posts: 188
Location: High Wycombe
No insult intended!

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 Post subject: Posted: Tue May 04, 2010 8:45 am

Joined: Thu Nov 12, 2009 1:36 pm
Posts: 192
Location: East Kent
Thanks for the explanations.

It makes sense now Fingers crossed I might be more succesful in finding the pattern next time!

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