I am a graduate with 'A' level maths (and incidentally author of the crazy golf odyssey 'Nutters with Putters') and wanted a reference book for my 9 year old.
We were discussing polygons and polyhedrons and I asked my son to look up 'polyhedron'.
I was dismayed that a picture of an octahedron was described as a tetrahedron!
So I decided to give the book a quick scan for other errors and it didn't take me long to find a host more. I wont detail them all here.
The definition for 'diagonal' is wrong. The explanations for cube roots and particularly square roots were very poor. I wasn't aware that there was a symbol for 'indirect proportion' but there is one for direct proportion which wasn't listed. Also not listed under division is the '/' symbol. Where is the definition for Trapezoid? The 'link words' should have been more thorough, 'cube' should link to 'power' for instance. What is the audience in the UK for this publication? If, it is as the title suggests when was the last time the publishers viewed the relevant curricula?
And I would have liked a little section at the back on common prefixes (poly, deci, equi etc) and suffixes. A 'family tree' of triangles and quadrilaterals would be nice too! I expected much more given that this is from the Oxford University Press.
And back to the original question and the answer is I'm not sure! Not sure at all!!