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Recent Posts
 Witnessing the woes of math homework January 19, 2018
 The mathematical boundary between a joke and a lie January 15, 2018
 Highlights of 2017 December 31, 2017
 Discovering the area of a trapezoid December 29, 2017
 “Math you can play” – books with games December 17, 2017
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 MATH and SCIENCE with my KIDS
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 Musings of a Mathematical Mom
 ШКОЛЬНЫЙ БЛОГ: Русская Школа "Золотой Ключик" в Филадельфии SCHOOL BLOG Golden Key Russian School in Philadelphia
Tag Archives: sets
Family Regrouping
Two sisters, two parents, two cousins, and four grandparents, all met up at the park (true story). During the car ride home, one of the sisters (lets call her Katie), exclaimed, “There were ten of us at the park.” The … Continue reading
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Tagged #tmwyk, 6 years old, arithmetic, counting, games, sets, word math games
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A bit of Set Theory
Katie and I joined my sister’s Golden Key Russian School – Katie attends and I help out my sister with the math classes. We hope to write semidetailed descriptions of the lessons on the school’s blog, but here I will … Continue reading
Onetoone correspondence – Not always obvious to kids!
There are some very hard problems in combinatorics that involve showing that there is a bijection (onetoone correspondence) between two set of objects, thus showing that the two sets have the same number of elements. On the other hand, we … Continue reading