This is my take on it:
3  16: 16/2= 8, 8-3=5
4  28: 28/2=14, 14-4=10
5 [?] 10: 10/2=5, 5-5=0
Hope this helps
the above looks like the correct technique, but i would of added the 1st and middle numbers and x2 =3rd no. If you see the pattern in the 1st 2 then the third one should follow suit. Normally i think it is preferred to work with the outside no.s.
Thank you, they both work.
Thanks colourful-rainbow for posting this question.
I was going to post the same one too....
Just did the paper yesterday. DD got 88%. She was very upset.
Thanks red for giving the answer.
I think it was a difficult paper compared to pack 1, but once you go over the questions and the techniques you could use for each one they should be fine.