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The mathematics achievement discrepancy between girls and boys, with its subsequent occupational consequences, is an issue that has received considerable attention in the literature. It is often referred to as the 'math‐gap' and favours boys. A major component of the explanation of this gap resides in determining its age of onset. We analyse here data from more than 10,000 (cross‐sectional study) and 2000 (longitudinal study) French students aged 4–7 years, tested in the framework of the Etude Longitudinale Française depuis l'Enfance (ELFE). The results allow to precisely determine the age of onset, since the gender difference, non‐existent (or even slightly in favour of girls) in kindergarten (4–5 years), is clearly in favour of boys in first grade (6–7 years). They could therefore provide an important element in the controversial debate on the origin of gender‐differentiated performance in mathematics. [ABSTRACT FROM AUTHOR]

The present study examined the development of mirror writing in typically developing children using a longitudinal design involving 166 children initially aged 4–5 years. The children were tested three times, with approximately one year between tests. The main predictions were that: (i) mirror copying of characters at T1 (4- to 5-years old) will be less frequent than mirror writing from memory at T2 (5- to 6-years old), (ii) an implicit right-writing rule—which holds that children orient single characters toward the right and hence most frequently reverse the left-oriented characters (e.g., 3, J)—explains well both character reversal at T2 and T3 and changes between T2 and T3 (6- to 7-years old), and (iii) name-mirror writing is possible as soon as children start learning to write. [ABSTRACT FROM AUTHOR]