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MathFour is Back!
For a while, a long while, I let this math blog just sit. I didn’t want to delete it. I spent too much time on it and I knew it was full of great stuff that was still being used. But I wasn’t in love with writing on it. In my lethargy, the hackers and…
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Seeing Math at Church
Can you see math at your church? I bet you can!
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Fahrenheit to Celsius – Graphically!
The conversion from Celsius to Fahrenheit and back again can be strange. One way to understand it is on a graph. And you can use this to teach some linear algebra too!
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Math Picture Book: One Grain of Rice
This is a new, and beautiful, take on the classic story of doubling your pay every day for 30 days.
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Math Picture Book: Perfect Square
Another fun math picture book – and this one inspires you to get out your scissors!
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Math Picture Book: The Grapes of Math
One of the best math picture books I’ve seen for counting and subitizing.
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Rules Aren't Complete without the Details!
Rules have two parts – the “must do” part and the details of when you must do that. We often forget the details when teaching math rules!
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Math Puzzle Inventing – Can You Do It?
Have you seen those email math games that return your birth-year? Think you can make your own?
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GeoGebra – Who's It Really For?
Does GeoGebra encourage discovery? Or does it encourage teachers to discover stuff for kids?
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GeoGebra – Overcoming the Fear
I’ve avoided GeoGebra for a year. But now that I’m in – I’m making circles and triangles dance!












