I have two pre-school age children attending Montessori. My question is do you think it is worth buying the Maths materials to use at home once they start national school? I believe that Maths is a very hard subject for children to grasp and I have a degree in Montessori(although I haven't worked in it for almost 10yrs) so I know how to present the materials. Maths can be such a hard subject for children that it has to benefit using concrete materials to explain it. It is just so expensive to buy it! I would be grateful for others opinion on the matter. Do you think it would benefit my kids or would they be as well off learning in the traditional drill and practice way???