Tag Archives: prime numbers

Just how many prime numbers are there?

Over the past few months, my 4th and 5th graders had a number of opportunities to explore prime numbers and factoring – they drew factor trees, discovered divisibility rules, played Prime Climb, and more.  Last Sunday, I decided that they … Continue reading

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Factor “trees”

Recently, we had a few lessons on prime numbers and factoring with my 4th and 5th graders.  Inspired by the beautiful drawings in this post, I had my students draw their own factor trees.  Actually, most of their creations can only … Continue reading

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Rectangular Numbers?

A few days ago Katie and I played the following game: one of us would say a number and the other one would have to make a rectangle out of that many squares (actually we used the board and chips … Continue reading

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