From your post I am not certain whether your so';s concentration and difficulties with numbers are the same or two separate concerns. If his concentration is only swaying when it comes to numbers it could very well be a form of dyslexia - one that is related to numbers alone. If this is the case, his outbursts would be understandable as an outlet of frustration: when you are good at many things and find only one difficult it seems almost illogical. For a diagnosis of ADD, his loss of concentration must be evident in more surroundings than just school; at home for example, while watching TV or participating in a family conversation. The best person to see initially is an educational psychologist who can give him a full assessment. In the meantime, try to ensure that as few negative comments are made in front of your son about his math ability or his concentration; this will only lower his self esteem and contribute to his frustration. If it is a form of dyslexia or ADD, he is not to blame for his difficulty; and if it is neither, just a matter of a poor mathematician, it is no reason for him to feel negatively about himself.
All the best,
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