This trick allows you to work out the surface area almost instantly of ANY rectangular prism (or box). How do you work out the TSA (total surface area) of a box - watch this video and you'll be able to do it instantly!

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Square numbers are numbers multiplies by themselves. These are written to the power of two.
The opposite of square numbers and square roots.

For the playlist of indicies and prime numbers.
https://www.youtube.com/playli....st?list=PLjbxBzUM6SL

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How to solve Simultaneous Equations by Elimination.

For more examples of how to solve simultaneous equations using the elimination method go here: https://www.youtube.com/playli....st?list=PLjbxBzUM6SL

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To look at the decimals playlist go to:
https://www.youtube.com/playli....st?list=PLjbxBzUM6SL

Subtracting decimals is fast and easy - just remember to line up place values and the decimal points. With this easy math lesson you can soon be able to subtract decimals without a problem. 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 is the fastest way to convert kilograms (kg) to pounds (lb), and then in trun to convert pounds to kilograms.
In this video we will look at how many pounds in a kilogram, and using this idea we will use a fast math trick to convert between the two.

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#convertingmeasurements
#convertingunits
#metric

#fastmathtricks
#mentalmath
#mathtrick Using algebra it can be proven that 2=1.
Use this math trick to fool your teacher, trick your friends or possibly end the universe.
Warning: do not try to do this in an enclosed space. To support free math on Patreon (thank you): https://www.patreon.com/tecmath 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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The Order of operations is the order in which you should do a maths equations. You've probably heard it called BODMAS or PEDMAS...even BIDMAS or PIDMAS....it's all the same thing!
First do anything in brackets (also called parenthesis). Second, do any orders (these are squared, cubed, square root and the like). Any multiplication or divide come next, and finally do any addition or subtraction...left to right. 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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Division of Fractions is easy - the trick is to know that you must invert (flip) the divisor (number being divided) - then multiply the fraction out. You will soon be able to divide any fraction with this fast math lesson.

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Casting out nines is a fast and easy method of making sure your math division calculations are correct. This trick is fast, easy, and accurate! 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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Coronavirus is here. The numbers are terrifying.
The number of cases worldwide doubles every four days.
We'll be at a million cases within two weeks.
The fatality rate of coronavirus is from 1 to 3.4% It requires hospitalisation in 19% of cases.
And we fiddle whilst Rome burns. To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU
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Multiplying Decimals is easy
To multiply decimals, first multiply as if there is no decimal. Next, count the number of digits after the decimal in each factor. Finally, put the same number of digits behind the decimal in the product.
#decimals #decimalmultiplication #howtomultiplydecimals


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How to divide decimals: first divide as if there is no decimal. Next, count the number of digits after the decimal in each number. Through a bit of subtraction you can work out where the decimal goes.
#decimals #decimaldivision #howtodividedecimals


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This method for working Least Common Multiple is both rapid and 100% accurate, even for the most difficult examples. To support free math on Patreon (thank you): https://www.patreon.com/tecmath 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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To learn the times tables use your hands as well as your head! Multiplication had never been so easy using this easy trick - including some of the six, seven, eight, nine and ten times table.

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How to convert between binary and decimal easily.

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#convertbinary
#binary
#binarydecimal

It is easy to convert work out perimeter - it is the distance measurement around the outside of a shape. 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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Lattice multiplication is a multiplication method that allows you multiply any two numbers quickly using a table.
It is especially useful in multiplying large numbers, with less mess and confusion than standard long multiplication.
This method has many names - Lattice multiplication, gelosia multiplication, the Hindu lattice, sieve multiplication as well as Venetian squares.

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Adding decimals is easy - just make sure all of the place values (especially the decimal place) line up. Through the information in this math lesson, and practice you will soon be adding decimals easily.


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How to square any numbers in your head - fast mental math trick here: https://www.youtube.com/watch?v=GEuyDHMG0jY

There is barely any calculation needed to mentally find the square a number that ends in five. How fast? The square of 45 is 1225; The square of 85 is 7225; the square of 115 is 12125; the square of 1095 is 1188125....as fast as I can type them I answer them!
The trick is this to faster squaring....
Say we have 65 squared. Get the number that is not 5 ( that is 6) and multiply it by the next number after it (7). Then just write 25 on the end.
So 6 x 7 = 42, our answer is 4225. Really. Simple 'eh?

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In this video we look at how to rapidly multiply any polynomial, as well as how to check our answer quickly for greater accuracy. In addition to this, we look at the application of multiplying polynomials to solve everyday math multiplication. This is an essential component of algebra. 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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