I would urge anyone who has a child with a big maths problems to have them tested for dyscalculia. I had never heard of this term until I had my 11 year old tested recently. My child has so many problems not counting properly, sequencing, anything with shapes is just so difficult and counting change is a nightmare and all this leads to underconfidence. I have recently had him assessed and his school who were never interested in helping now will give him extra time in his SATs in May. He is so much happier knowing he is not thick but has a general learning problem - it can be genetic too!
Don't delay seek an assessment, privately as I did as some schools are just not switched on about this condition.