"I did my GCSEs in 2004 and definitely did not have any maths questions along the lines of "write this number in words - 300,000". This must be a very low tier examination. I think you need to look at the questions for the higher paper and see if you can do them."
The maths papers nowadays have tiered questions, if that makes sense. This is what the media fall upon and say "look at this question on a GCSE paper, shock, horror!"
Therefore, getting a question such as the above right will give you a G grade. For an F grade you need to get a harder question right. For a C grade, you need to answer coorectly questions that a primary school child most definitely wouldn't be able to do, such as drawing a straight line graph from an algebraic equation. For an A grade, you need to manipulate surds, put numbers into standard index form, calculate volumes of irregular shapes, and solve the same sort of algebra we did at school, amongst other things.
I have just put my home educated daughter through maths GCSE at foundation level (top grade available C) and we are now working towards higher for this year. At first I looked at the first questions on the paper and thought "this is easy". But as we went through I got a grip on how the sytem works, and realised that if she wanted a C, it was the hardest questions on the foundation paper she needed to get right.
The higher paper has harder questions (those aimed at A*, A and B grade students which foundation doesn't) and much less of the easy lower grade ones, but will still have a few you would think easy as a safety net so that those who fail can prove themselves capable of getting, say, a D grade, instead of a U.
I think a lot of GCSEs work this way. I read so much utter crap in the media and I wish they would just do a bit of research instead of picking the G grade questions, and quoting them to show how easy a GCSE is to get.
And by the way, not seeing her working means nothing. I did virtually nothing for my pretty impressive set of O levels, because I didn't need to. The few days before DD's GCSEs, you probably wouldn't have seen her doing anything either, because it is much more efficient to learn it before this late stage and give the brain a bit of resting time.