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Prior studies have shown that children as young as infants can judge simple mathematical relationships. When shown bunches of dots on a computer screen, for example, a preschool- or kindergarten-age child can tell that there are more dots combined in an image of 21 dots followed by one of 30 dots compared with a third 34-dot image.
Läs mer: The New Math: Kids Can Add and Subtract without Arithmetic: Scientific American