# 9-demicube

In geometry, a demienneract or 9-demicube is a uniform 9-polytope, constructed from the 9-cube, with alternated vertices removed. It is part of a dimensionally infinite family of uniform polytopes called demihypercubes. E. L. Elte identified it in 1912 as a semiregular polytope, labeling it as HM9 for a 9-dimensional half measure polytope. Coxeter named this polytope as 161 from its Coxeter diagram, with a ring onone of the 1-length branches, and Schläfli symbol or {3,36,1}. (Wikipedia).

7 - MegaFavNumbers

#MegaFavNumbers

From playlist MegaFavNumbers

Ignite Boston 9: Doug Sweetser

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From playlist The BuShou of HanZi

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From playlist MegaFavNumbers

MegaFavNumbers: Plus One Primes, 154,641,337, and 62,784,382,823

My entry in the #MegaFavNumbers series looks at a particularly striking example of a very specific family of primes -- and how it connects to what digits can be the final digit of primes in different bases.

From playlist MegaFavNumbers

This Problem Stumped Vietnamese Students - Solution To Viral Puzzler

This problem was asked to students in Vietnam. Can you figure it out? Place the numbers 1 to 9, using each number once, to make a valid equation. In this video I explain how you can solve this problem logically. UPDATE: I've posted all 136 solutions, at the end of this description, found

From playlist Viral Math Memes

Between 1&9 Sudoku AKA "Sandwich Sudoku"!

Simon takes a look at this outstanding puzzle created by one of our viewers, thank you Isaac Resnikoff. We're also delighted to note that Alex Bellos, author of some brilliant puzzle books (like Alex's Adventures In Numberland), has written an article about our channel and this Sudoku var

From playlist "Sandwich Sudoku"/Between 1&9 Sudoku

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It helps to visually understand what decomposing a fraction looks like. We're pretty sure you're going to like this. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/fractions-pre-alg/decomposing-fractions-pre-alg/e/decomposing-fract

From playlist Fractions | Pre-Algebra | Khan Academy

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From playlist EngageNY Grade 3 Module 3

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More resources available at www.misterwootube.com

From playlist Using Complex Numbers

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From playlist Adding and Subtracting Integers

A sudoku with only 3 givens? How is that even possible?

An elegant variant sudoku from the UK Open Sudoku tournament. This is called "Between 1 & 9" sudoku

From playlist "Sandwich Sudoku"/Between 1&9 Sudoku

EngageNY Grade 3 Module 3 Lesson 14

EngageNY/Eureka Math Grade 3 Module 3 Lesson 14 For more videos, please visit http://bit.ly/engageportal

From playlist EngageNY Grade 3 Module 3