LINK: https://books.google.at/books?id=GE8HBAAAQBAJ&pg=PA80&lpg=PA80&dq=Mathematik+zum+Anfassen.+50+mathematische+Experimente+pdf&source=bl&ots=giPpKO_jvd&sig=ACfU3U1R_a5HUoEbMc3iZkWWVK2ZeShTKQ&hl=de&sa=X&ved=2ahUKEwjPzvGNooGAAxWVXvEDHQIABwE4HhDoAXoECB4QAw#v=onepage&q=Mathematik%20zum%20Anfassen.%2050%20mathematische%20Experimente%20pdf&f=false
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