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 Post subject: Difficult VR questions!
PostPosted: Thu Aug 01, 2019 7:38 am 
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Joined: Fri Mar 01, 2019 5:04 pm
Posts: 70
Please help as I'm stumped!
1) (50{20}10). (80{30}20)
(40{?}8)

2)
(20{22}9). (30{30}15)
(25{?}10)

3)
(4{11}3). (9{13}6)
(11{?}4)

Any tips much appreciated


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PostPosted: Thu Aug 01, 2019 7:51 am 
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Joined: Mon May 16, 2011 1:05 pm
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Location: Reading
I’m not going to assume you know what to do with these, so apologies if you do.
The numbers either side of the bracket can be mathematically used to get the middle number. The operations required are the same for all three, so once you figure out how the two known ones work you can work out the unknown one.

There’s only one or two arithmetic operations to get these.

So only -+/x are used plus halving/doubling.

The first one requires subtraction and halving, to get you started.


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PostPosted: Thu Aug 01, 2019 7:58 am 
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Joined: Mon May 16, 2011 1:05 pm
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Location: Reading
Btw practice is the key for these. DD hated them to start with but with practice she could spot them straight away.

6 years later and she hasn’t lost the knack either. I’ve just checked. :wink:


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PostPosted: Thu Aug 01, 2019 8:00 am 
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Joined: Fri Mar 01, 2019 5:04 pm
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Thinkers
Now I understand!
Thank you so much


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