Tag Archives: 4 years old

Symmetry is beautiful!

Today Katie and I spent the morning playing with symmetry.  This post will mostly consist of pictures because symmetry is better illustrated visually than verbally.  However, I would like to describe the rules of our ‘game’.  We had an axis … Continue reading

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To win or not to win?

I am sure that almost every parent has faced this dilemma when introducing a strategy game to their kids: in those first few critical games, how often should I win and how often should I give in?  On one hand … Continue reading

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Functions – not so scary!

In many math curricula, functions are treated as something complicated and mysterious and they don’t get introduced until some time in middle school.  But in fact, the basic idea is very simple and beautiful.  A few days ago I introduced … Continue reading

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One-to-one correspondence – Not always obvious to kids!

There are some very hard problems in combinatorics that involve showing that there is a bijection (one-to-one 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

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Making kids comfortable with basic arithmetic

I am not a fan of drills and I think that making kids do daily worksheets with x addition/subtraction problems is the sort of thing that makes kids conclude that math is a boring subject.  That being said, I do … Continue reading

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Kids can have the same revelation multiple times!

Yesterday Katie wanted the dolls to have another ball (in general, we decided that the balls were going to happen once a week, but yesterday was going to be an exception).  While I was eating dinner, Katie took her dolls … Continue reading