This easy visual proof shows that the area of a circle is πr2.


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Trigonometry is an easy way to work out the unknown sides and angles of a right angled triangle. The trick - know the side names - the opposite, hypotenuse, and adjacent, and know how and when to apply the trigonomic functions - sin, cos and tan. this is the only trick to getting it right every time!
In this lesson, students learn work out unknown angles using use sine, cosine, and tangent. You will need a scientific calculator for the problems in this lesson - and I'll show you how to access one on your computer. To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU
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In this lesson, you will learn to multiply fractions quickly and easily.
To multiply fractions you multiply across the numerators (the top number of a fraction) and multiply across the denominators (the bottom number).

An example I always use to start this off is multiply 1/2 with a 1/2. The numerators multiply to give 1 (1 x1), the denominators multiply to give 4 (2x2). Hence a 1/2 multiplied by a 1/2 is 1/4.

What about if you multiply 2/3x1/4?
Top number (2x1), bottom number (3x4).
So 2/3x1/4 = 2/12. To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU
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How to instantly add large sets of double digit numbers mentally.
Using this mental math method you will be able to add any number of two digit numbers with each other - faster than a calculator! Become a math genius in no time using this trick!

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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://www.youtube.com/playli....st?list=PLjbxBzUM6SL

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How are your adding fraction skills? Can you win this challenge?

This video is part of a playlist:
https://www.youtube.com/playli....st?list=PLjbxBzUM6SL

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#fractions
#fraction
#fractionsmath

Adding and Subtracting Mixed Numbers

This video is part of a playlist:
https://www.youtube.com/playli....st?list=PLjbxBzUM6SL

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#fractions
#fraction
#fractionsmath

This problem can be approached a number of ways...but can you solve it?
Good luck!

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For the playlist of math problems:
https://www.youtube.com/playli....st?list=PLjbxBzUM6SL


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#mathproblems
#mathriddles
#mathsforfun

This math multiplication trick is easy to do, and can be used to directly multiply large numbers! Math is easy with the tecmath math method of multiplication (say that five times fast!)

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#fastmathtricks
#mentalmath
#mathtrick The easy way how to multiply numbers under twenty - faster than a calculator!
Become a math genius the smart way - using vedic math - not the way you've been taught! To support free math by tecmath on Patreon (thankyou): https://www.patreon.com/tecmath

Vedic Maths is series of mathematical tricks, originating in a book written by an Indian monk Swami Bharati Krishna Tirtha in 1965. It contained a list of mental calculation techniques which were claimed to be retrieved from the Vedas - are a large body of religious texts originating in ancient India.
Please if you are learning this, however, do not treat multiplication as a mere trick. It is important to remember 17 x 13 for example, is the repeated adding of 17, 13 times (17 + 17 + 17 + 17...).
This method is a shortcut, but as the end proof shows, it is using a shuffling of required calculations to make this multiplication more efficient.
For 17 x 13, we have lots of multiplication going on (that is repeated addition!) - 10 x 10 and 3 x 10 and 7 x 10 (lots of 10s - 20 all up) - and 7 x 3.

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The nine times table is one of the easiest times tables - if you know these tricks! Make maths multiplication easy! This video is epsecially for people learning thenine times table!

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The easy way how to multiply numbers under twenty - faster than a calculator!
Become a math genius the smart way - using vedic math - not the way you've been taught!

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Surface Area Half Cylinders To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU
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This trick allows you to multiply two numbers quickly and accurately, using a handy visual method - lines.
It also shows how to deal with zeros and larger numbers, for easier multiplication.

This method does not use any multiplication tables, making it accessible to all learners.

The first of the videos showing how to multiply with lines is here: https://www.youtube.com/watch?v=_AJvshZmYPs&list=PLjbxBzUM6SLkk-Pm6oDtvJc-lsM-xli_1&index=10

Arithmetic made simple!

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Finding the square of a nmuber is easy - just follow these mental math tricks. You'll be able to calculate squares faster than ever and amaze everyone with your utter genius!

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#fastmathtricks
#mentalmath
#mathtrick

The trick to getting the right answer with volume calculations every time. Be a math genius with mental math. To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU
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In this math tutorial we look at the trick for quickly converting between the two main temperature scales - Celsius and Fahrenheit. This method will allow you to simply convert between the two forth and back, back and forth, and then back, and then forth again!

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If Teresa’s daughter is my daughter’s mother, what am I to Teresa?
This video looks at the answer to the Teresa's Daughter puzzle, as well as these similar ones...

A man is looking at a picture of a man on the wall and states,
“Brothers and sisters I have none, but this man’s father is my father’s son.”
Who is the man in the picture in relation to the man looking at the picture?

I am your mother’s brother’s only brother-in-law. Who am I?

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#mathproblems
#mathriddles
#mathsforfun

It is easy to convert work out the perimeter of a circle - using pi, radius and diameter.

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In this video we look at how to multiply two binomial expressions instantly, as well as how to check our answer quickly for greater accuracy. In addition to this, we llok at the application of multiplying binomials to solve everyday math multiplication. This is an essential component of algebra. T

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