What is the underlying cause of this problem
Steve Chin, a specialist in this area, has pinpointed 'poor short term and working memories, both of which are key pre-requisite skills for mental arithmetic and indeed mathematics in general'. Because traditional maths teaching relies heavily on memorising facts and processes this can create a significant barrier to learning from the outset
In Chin's view this problem is exacerbated by a focus on memorising facts (e.g learning tables) rather than understanding Mathematical processes:
Better performing peers use linking strategies which are based on understanding numbers, operations and how they relate. Lower performing pupils seem far less able to employ these significantly useful strategies.He also believes that the focus on speed in solving mathematical problems disadvantages those who process information slowly.
What are the best strategies for dealing dyscalculia or general difficulty with number?
The most important thing to remember is none of us like to be wrong. And for some the school experience of Maths is of being continually wrong over a prolonged period. That is why so many internalize this failure ('I can't do Maths!): numbers become a source of fear and loathing.
So the first objective is to remove anxiety by demonstrating what the learner already can do e.g. counting forward.
1. Return to the basic elements of computation: counting (forward and backwards)
2. Assess the level of working and short term memory. This can be done by asking a learner to repeat back a series of numbers (the acts of remembering and reordering are key elements of working memory). Most adults can remember around seven digits. Those with special needs typically can work with three.
3. Build on what is known - counting for example, to develop essential skills: computation, sequence and place value.
Better performing peers use linking strategies which are based on understanding numbers, operations and how they relate. Lower performing pupils seem far less able to employ these significantly useful strategies. Source http://www.stevechinn.co.uk/
4. Simplify vocabulary and visual presentation of Maths problems.
The Dyscalculia Toolkit: Supporting Learning Difficulties in Maths (Book & CD-Rom)