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Resumen

Reproductive thinking, the habit of using ready-made answers, has Iwo advantages: it is easier both to reach and to test. Productive thinking, creating new answers and using new organizations is more difficult to teach and needs more time and more dynamic teaching relations. Through the process of two problem -solving situations (one by 14-15 years old pupils and the other by 15-16 years old) some reasons are suggested in this paper which argue in favour of mathematical activities more creative than repetitive.