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www.mathsisfun.com
| | rheingoldheavy.com
45.3 parsecs away

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| | This calculator is used with the HC-SR04 Ultrasonic Distance Sensor to verify accuracy by calculating distances and pulse lengths.
| | gowers.wordpress.com
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| | A couple of months ago, I can't remember precisely how, I became aware of a book called How I Wish I'd Taught Maths, by Craig Barton, that seemed to be highly thought of. The basic idea was that Craig Barton is an experienced, and by the sound of things very good, maths teacher who used...
| | www.goodmath.org
48.5 parsecs away

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| | Over time, I've come to really, really hate the number ?. is the so-called golden ratio. It's the number that is a solution for the equation (a+b)/a = (a/b). The reason that t...
| | nicholasjoncrane.wordpress.com
62.0 parsecs away

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| There are a number of stimulating reflections/provocations/proposals, etc., in this post by John Krygier about Matt Wilson'sNew Lines.