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Math Thoughts

Techniques, Cool Ideas, Teaching, Rants

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The Euclidean Algorithm: Curiosity Satisfied – Sadly

The Euclidean Algorithm is a (the) way of finding a common factor between two numbers, say a and b. The method is to divide the smaller number into the larger and then divide the remainder into the smaller and continue Continue reading

Packing Circles with Unequal Radii – Stacking Corks Edition

A part of my wine cork construction project, a few years, was a trivet out of wine corks. Here it is. It is wonderfully light and holds hot dishes well away from the table. Looking directly down on it, one Continue reading

A Mathematician Slices Carrots – Part IV

This post shows all the calculations I needed for getting equal total surface areas including the derivation of the surface area of an oblique cone using double integral calculus. I am still using OneNote for graphs and formulas, hence this Continue reading

A Mathematician Slices Carrots – Part III

I want to slice carrots for a salad. I have a conical carrot and a blue cutting board and an invisible knife. I could choose to make all the slices (slicing perpendicular to the cone s axis) the same thickness. But Continue reading

A Mathematician Slices Carrots – Part II

This post shows a derivation of the volume of an oblique cone using pure geometry. I am still using OneNote for graphs and formulas, hence this PDF.

A Mathematician Slices Carrots – Part I

I want to slice carrots for a salad. I have a conical carrot and a blue cutting board and an invisible knife. I could choose to make all the slices (slicing perpendicular to the cone s axis) the same thickness. But Continue reading

Find Decimal Fractions using Powers of Five

Decimal Approximations Download

Method of Nines for Finding Repeating Decimals

Again, the post in a PDF. It is just easier to compose in OneNote and insert the file in the blog. Use your browser zoom to make it bigger if you need to as I do.

Thoughts on a Word Problem

I created this post using OneNote. It was easier just to import a PDF

Tiling-Cubical Solids : Felted Platters-Wooden Boxes

My crafty side needed attention. Hence the following. Here are some boxes I made out of Port Orford Cedar and Combed Cedar siding. The cube has a sliding dowel hidden latch so it must be oriented in a certain position for Continue reading