Four fours is a mathematical puzzle, the goal of which is to find the simplest mathematical expression for every whole number from 0 to some maximum, using only common mathematical symbols and the digit four. No other digit is allowed. Most versions of the puzzle require that each expression have exactly four fours, but some variations require that each expression have some minimum number of fours. The puzzle requires skill and mathematical reasoning. The first printed occurrence of the specific problem of four fours is in Knowledge: An Illustrated Magazine of Science in 1881. A similar problem involving arranging four identical digits to equal a certain amount was given in Thomas Dilworth's popular 1734 textbook The Schoolmaster's Assistant, Being a Compendium of Arithmetic Both Practical and Theoretical. W. W. Rouse Ball described it in the 6th edition (1914) of his Mathematical Recreations and Essays. In this book it is described as a "traditional recreation". (Wikipedia).
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From playlist Indices, powers & roots
Using a set of points determine if the figure is a parallelogram using the midpoint formula
👉 Learn how to determine the figure given four points. A quadrilateral is a polygon with four sides. Some of the types of quadrilaterals are: parallelogram, square, rectangle, rhombus, kite, trapezoid, etc. Each of the types of quadrilateral has its properties. Given four points that repr
From playlist Quadrilaterals on a Coordinate Plane
Determining if a set of points is a rhombus, square or rectangle
👉 Learn how to determine the figure given four points. A quadrilateral is a polygon with four sides. Some of the types of quadrilaterals are: parallelogram, square, rectangle, rhombus, kite, trapezoid, etc. Each of the types of quadrilateral has its properties. Given four points that repr
From playlist Quadrilaterals on a Coordinate Plane
How to determine if a set of points makes up a rectangle using the distance formula
👉 Learn how to determine the figure given four points. A quadrilateral is a polygon with four sides. Some of the types of quadrilaterals are: parallelogram, square, rectangle, rhombus, kite, trapezoid, etc. Each of the types of quadrilateral has its properties. Given four points that repr
From playlist Quadrilaterals on a Coordinate Plane
Determine if a set of points makes up a rectangle using the distance formula
👉 Learn how to determine the figure given four points. A quadrilateral is a polygon with four sides. Some of the types of quadrilaterals are: parallelogram, square, rectangle, rhombus, kite, trapezoid, etc. Each of the types of quadrilateral has its properties. Given four points that repr
From playlist Quadrilaterals on a Coordinate Plane
Determining if a set of points makes a parallelogram or not
👉 Learn how to determine the figure given four points. A quadrilateral is a polygon with four sides. Some of the types of quadrilaterals are: parallelogram, square, rectangle, rhombus, kite, trapezoid, etc. Each of the types of quadrilateral has its properties. Given four points that repr
From playlist Quadrilaterals on a Coordinate Plane
How to determine if a set of points is a rectangle, rhombus or square
👉 Learn how to determine the figure given four points. A quadrilateral is a polygon with four sides. Some of the types of quadrilaterals are: parallelogram, square, rectangle, rhombus, kite, trapezoid, etc. Each of the types of quadrilateral has its properties. Given four points that repr
From playlist Quadrilaterals on a Coordinate Plane
Determine if a set of points is a parallelogram using the distance formula
👉 Learn how to determine the figure given four points. A quadrilateral is a polygon with four sides. Some of the types of quadrilaterals are: parallelogram, square, rectangle, rhombus, kite, trapezoid, etc. Each of the types of quadrilateral has its properties. Given four points that repr
From playlist Quadrilaterals on a Coordinate Plane
How to determine if points are a rhombus, square or rectangle
👉 Learn how to determine the figure given four points. A quadrilateral is a polygon with four sides. Some of the types of quadrilaterals are: parallelogram, square, rectangle, rhombus, kite, trapezoid, etc. Each of the types of quadrilateral has its properties. Given four points that repr
From playlist Quadrilaterals on a Coordinate Plane
You, me, and my first International Math Olympiad problem
My first international math olympiad (IMO) question. We will find the sum of the digits of the sum of the digits of the sum of the digits of 4444^4444. This is a pretty famous number theory problem. Subscribe for more math for fun videos 👉 https://bit.ly/3o2fMNo 💪 If you would also l
From playlist Number Theory | math for fun
Determine The Value of Basic Exponential Expressions (Common Core 5/6 Math Ex 1)
This video explains how to simplify basic exponential expressions. http://mathispower4u.com
From playlist Common Core Grade 5/6 Practice Standardized Test Math Problems
Genuinely Approachable Sudoku - the "Speedrun"
Here are the five puzzles played in this video GAS 1: Renban Quadruples Sudoku by Clover: https://app.crackingthecryptic.com/sudoku/3qG93JFb6M Normal sudoku rules apply. Circles show digits that must each appear in at least one touching cell. Lines are occupied by a sequence of consecutiv
From playlist All the GAS - Genuinely Approachable Sudokus
Describe Sums and Differences of Integers (Common Core Math 7/8 Ex 19)
This video explains how to find sums and differences of integers and then describe them as greater than 0, less than 0, or equal to 0. http://mathispower4u.com
From playlist Common Core Grade 7/8 Practice Standardized Test Math Problems
Here are the URLs for today's puzzles: GAS 366 – G, as in GAS by Clover: https://tinyurl.com/5n767956 Normal sudoku rules apply. Digits along a thermometer must strictly increase (not necessarily consecutively), starting from the round bulb. Digits separated by a black dot must be in a 1:
From playlist All the GAS - Genuinely Approachable Sudokus
Scientific Notation - Basic Introduction
This chemistry video tutorial provides an introduction into scientific notation. It explains how to perform operations like addition, subtraction, multiplication and division with scientific notation. It tells how you to write a number in scientific notation and how to convert back to st
From playlist New Physics Video Playlist
Selecting the BEST Regression Model (Part D)
Regression Analysis by Dr. Soumen Maity,Department of Mathematics,IIT Kharagpur.For more details on NPTEL visit http://nptel.ac.in
From playlist IIT Kharagpur: Regression Analysis | CosmoLearning.org Mathematics
Here are the URLs for today's 5 Genuinely Approachable Sudoku (GAS) puzzles: GAS 141 – Minmax Sudoku by Clover https://tinyurl.com/4awj5kfu Normal sudoku rules apply. A value outside the grid gives the sum of the largest and smallest of the first three digits in that row or column, seen f
From playlist All the GAS - Genuinely Approachable Sudokus
GAS 146 – Breaking News by Philip Newman:https://tinyurl.com/caaj22mu Normal sudoku rules apply. Grey regions must also contain the digits from 1 to 9 without repeats. GAS 147 – LK Clone by Clover: https://tinyurl.com/6m8tw8v4 Normal sudoku rules apply. Shapes of the same color are clone
From playlist All the GAS - Genuinely Approachable Sudokus
Here are the five puzzles in today's video: GAS 126 – Odd Sum Pair by Cloverhttps://tinyurl.com/yn8r37hp Normal sudoku rules apply. Two digits separated by a small dot must sum to an odd value. Not all possible dots are necessarily given. GAS 127 – Max Odd/Even Run by Sam Cappleman-Lynesh
From playlist All the GAS - Genuinely Approachable Sudokus
Determine if a set of points is a trapezoid or not
👉 Learn how to determine the figure given four points. A quadrilateral is a polygon with four sides. Some of the types of quadrilaterals are: parallelogram, square, rectangle, rhombus, kite, trapezoid, etc. Each of the types of quadrilateral has its properties. Given four points that repr
From playlist Quadrilaterals on a Coordinate Plane