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For questions in Mathematics Education as a scientific discipline. For more hands-on questions on teaching Mathematics, please use the tag teaching. There is also a Stack Exchange community http://matheducators.stackexchange.com/
13
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"Mathematics talk" for five year olds
If there are more than 26 kids in the group, you can tell them you know for sure that two of them have names starting with the same letter (more than 12: birthday in the same month, and so on). In a c …