News from the web:
"Dyscalculia is sometimes called number blindness. It is the name given to the condition that affects our ability to acquire arithmetical skills. Mathematics is a complex subject, involving language, space and quantity. Much research into the development of mathematical skills has focused upon counting or arithmetic, but even at early levels many complex abilities are involved in these skills, including: ◆ understanding number words (one, two, … twelve, …twenty, …), numerals (1, 2, … 12, … 20, …) and the relations between them; "
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