Help with an IPS question...

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dottie1974
Posts: 192
Joined: Thu Nov 12, 2009 2:36 pm
Location: East Kent

Help with an IPS question...

Post by dottie1974 »

....OK it's my turn for needing help (with the potential for completely embarrasing myself when the answer is obvious :oops: ) - 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
tigger
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Joined: Mon May 18, 2009 9:21 am
Location: Gloucestershire

Post by tigger »

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
stevew61
Posts: 1786
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Location: caversham

Post by stevew61 »

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! :lol:

steve
MrsChubbs
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Location: High Wycombe

Post by MrsChubbs »

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. :)
stevew61
Posts: 1786
Joined: Fri Nov 17, 2006 9:54 pm
Location: caversham

Post by stevew61 »

I think this one is a bit simpler than you are thinking
:lol:

Yep, shall I compound my error by admitting I looked at that solution and failed? :lol:
MrsChubbs
Posts: 363
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Location: High Wycombe

Post by MrsChubbs »

:lol: No insult intended!
dottie1974
Posts: 192
Joined: Thu Nov 12, 2009 2:36 pm
Location: East Kent

Post by dottie1974 »

Thanks for the explanations.

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