Help with maths questions - GL pack 3

11 Plus Maths – Preparation and Information

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kal12003
Posts: 169
Joined: Thu Mar 06, 2014 2:50 pm

Help with maths questions - GL pack 3

Post by kal12003 »

Can anyone help in explaining the following please?
y is 1/2 of x

Which of the following is incorrect?
x = 2y
y = 2x Answer ( Dd thought this was correct)
y = x/2
x/y = 2
y/x = 1/2
kenyancowgirl
Posts: 6738
Joined: Mon Oct 21, 2013 8:59 pm

Re: Help with maths questions - GL pack 3

Post by kenyancowgirl »

If y is half of x, x is obviously bigger than y.

Therefore y= 2x cannot be right as 2x effectively means 2 times x.

If x is bigger than y already, multiplying it by 2 is going to make it even bigger, therefore y cannot possibly = 2x!!!
kal12003
Posts: 169
Joined: Thu Mar 06, 2014 2:50 pm

Re: Help with maths questions - GL pack 3

Post by kal12003 »

Thank you! Will show to Dd now :)
Guest55
Posts: 16254
Joined: Mon Feb 12, 2007 2:21 pm

Re: Help with maths questions - GL pack 3

Post by Guest55 »

Try thinking in numbers as well. y is 1/2 of x is the same as 5 is half of 10 ...

y .... x
5 .....10

so then test out.
kal12003
Posts: 169
Joined: Thu Mar 06, 2014 2:50 pm

Re: Help with maths questions - GL pack 3

Post by kal12003 »

Thank you Guest55 - makes it easier to understand like that!
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