Mental calculation consists of arithmetical calculations using only the human brain, with no help from any supplies (such as pencil and paper) or devices such as a calculator. People may use mental calculation when computing tools are not available, when it is faster than other means of calculation (such as conventional educational institution methods), or even in a competitive context. Mental calculation often involves the use of specific techniques devised for specific types of problems. People with unusually high ability to perform mental calculations are called mental calculators or lightning calculators. Many of these techniques take advantage of or rely on the decimal numeral system. Usually, the choice of radix is what determines which method or methods to use. (Wikipedia).
Visualizing decimal numbers and their arithmetic 67 | Arithmetic and Geometry Math Foundations
This video gives a precise definition of a decimal number as a special kind of rational number; one for which there is an expression a/b where a and b are integers, with b a power of ten. For such a number we can extend the Hindu-Arabic notation for integers by introducing the decimal form
From playlist Math Foundations
Determine Rational or Irrational Numbers (Square Roots and Decimals Only)
This video explains how to determine if a given number is rational or irrational.
From playlist Functions
#2 Idenitfying Irrational numbers
An example that helps in identifying irrational numbers and understanding the basic concepts of irrational numbers.
From playlist Middle School This Year
What are Rational Numbers? | Number System Concept | Don't Memorise
Watch this video to know more about Rational Numbers, Irrational Numbers, Real Numbers and Number System To learn more about Real Numbers, enroll in our full course now: https://infinitylearn.com/microcourses?utm_source=youtube&utm_medium=Soical&utm_campaign=DM&utm_content=SQ4cB9yXkHM&utm
From playlist Middle School Arithmetic (Part 3)
What are Irrational Numbers? | Number System | Don't Memorise
Watch this video to know more about Rational numbers, Irrational Numbers, Real Numbers and Number System. To learn more about Irrational Numbers, enroll in our full course now: https://infinitylearn.com/microcourses?utm_source=youtube&utm_medium=Soical&utm_campaign=DM&utm_content=CtRtXoT_
From playlist Irrational Numbers
Evaluating a rational expression and order of operations
👉 Learn how to evaluate mathematics expressions. A mathematics expression is a finite combination of numbers and symbols formed following a set of operations or rules. To evaluate a mathematics expression means to obtain the solution to the expression given the value(s) of the variable(s)
From playlist Simplify Expressions Using Order of Operations
Using the LCD to solve a rational expression
👉 Learn how to solve rational equations. A rational expression is an expression in the form of a fraction where the numerator and/or the denominator are/is an algebraic expression. There are many ways to solve rational equations, one of the ways is by multiplying all the individual rationa
From playlist How to Solve Rational Equations
👉 Learn about solving rational equations. A rational expression is an expression in the form of a fraction where the numerator and/or the denominator are/is an algebraic expression. There are many ways to solve rational equations, one of the ways is by multiplying all the individual ration
From playlist How to Solve Rational Equations | Learn About
Learn to solve a rational equation by multiplying by the LCD
👉 Learn how to solve rational equations. A rational expression is an expression in the form of a fraction where the numerator and/or the denominator are/is an algebraic expression. There are many ways to solve rational equations, one of the ways is by multiplying all the individual rationa
From playlist How to Solve Rational Equations with an Integer
Estimate PERCENT – Mental Math / NO Calculator
TabletClass Math: https://tcmathacademy.com/ Math help with percent and how to use mental math to estimate percent. For more math help to include math lessons, practice problems and math tutorials check out my full math help program at https://tcmathacademy.com/ Math Notes: Pre-A
From playlist GED Prep Videos
Can you do this type of multiplication instantly in your head?
ome people may find these easy - others not - but it is essential if you want to easily mentally multiply bigger numbers that you first master this. Please like and subscribe! Here is THE mental multiplication lesson playlist - progressing you through your mental multiplication. https:/
From playlist Multiplication mental
Minds, Brains, & Science - John Searle (1984 Reith Lectures)
In this series of lectures, John Searle, former Professor of Philosophy at Berkeley, examines the connections between minds, brains, and science. These lectures were given as part of the 1984 BBC Reith Lectures, but are still just as relevant today. Some of the topics discussed include fre
From playlist Philosophy of Mind
Using NLP for Diagnosis of Mental Health Disorders I Healthcare NLP Summit 2021
Get your Free Spark NLP and Spark OCR Free Trial: https://www.johnsnowlabs.com/spark-nlp-try-free/ Register for NLP Summit 2021: https://www.nlpsummit.org/2021-events/​ Watch all Healthcare NLP Summit 2021 sessions: https://www.nlpsummit.org/​ Natural language processing (NLP) tools ha
From playlist Healthcare NLP Summit 2021
Strategies for Mentally Calculating Percentages
More resources available at www.misterwootube.com
From playlist Fractions, Decimals and Percentages
This youtube video tutorial on percentages made easy explains how to calculate the percentage of a number mentally using your head without a calculator. This video contains plenty of shortcuts and tricks explaining how to find a percentage of a whole number. it goes over the basics and e
From playlist GED Math Playlist
How To Find a Percent of a Number - Without a Calculator!
This math video tutorial explains the process of finding percents of a number mentally and confirming the answer using decimals. This video contains plenty of examples and practice problems. This video is useful for those who wish to understand how to calculate percentages of money. Pre
From playlist Pre-Algebra Video Playlist
Convert Fractions to Percentages
Mentally Convert Fractions to Percentages sometimes.....not always possible! This video is part of a playlist: https://www.youtube.com/playlist?list=PLjbxBzUM6SLnSYop8JXLu9zciW-rn7yyD To support tecmath making new math videos on Patreon: https://www.patreon.com/tecmath To donate to the
From playlist Fractions
When Is Christmas? Mentally Convert Date To Day Of The Week
January 1, 2016 is a Friday. When will Christmas be in 2016? What about Christmas in 2055? You can do this in your head! Blog post (text explanation): http://wp.me/p6aMk-4qQ Doomsday Rule (previous video): https://www.youtube.com/watch?v=UsStBxY9STw Calculating the day New Years (1/1) o
From playlist Mental Math Tricks
Solve an equation with a rational term
👉 Learn how to solve rational equations. A rational expression is an expression in the form of a fraction where the numerator and/or the denominator are/is an algebraic expression. There are many ways to solve rational equations, one of the ways is by multiplying all the individual rationa
From playlist How to Solve Rational Equations with an Integer