Reading, writing, and spelling are often difficult and confusing. This is caused by the fact that quite a number of words have a meaning that can not be readily pictured. The list includes common words like if, and, or, the, with.
Similarly, numerals and arithmetic symbols may be confusing. For instance, knowing what “three” looks like (3) does not necessarily mean a person knows that it is a symbol that represents a quantity (o o o.)
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