This trick is a great one.
It uses an amalgamation of other mental math techniques - and will have you smashing those calculations.

Here is THE mental multiplication lesson playlist - progressing you through your mental multiplication.
https://www.youtube.com/playli....st?list=PLjbxBzUM6SL

Here is that link how to multiply questions like 49 x 40 instantly
https://youtu.be/yZULgerBRms

The rest are links where I beg for money.

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This math lesson looks at pythagorean math - how to work out the unknown sides of right angles triangle. The 3,4,5 triangle will also be explored. Become a math genius!

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This math trick let's you count up to over 1000 using just your hands. What's more you'll learn a secret code for communicating numbers.

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To work out the fraction of an amount, first of all it is essential to convert the fraction to a decimal.
To do this divide the numerator (top number) by the denominator (bottom number). eg - 1/5 = 0.2 Then times this answer by the amount you wish to find a fraction of.
e.g 1/5 of 20 = 0.2 x 20 = 4
To work out the percentage of an amount, it is also essential to first convert the percentage to a decimal.
To do this move the decimal place left two spaces - eg - 25% = 0.25 Then times this answer by the amount you wish to find apercentage of.
e.g 25% of 20 = 0.25 x 20 = 5. 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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Calculate the cube of any number between 1 and 100 fast

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To go to the fractions, decimal and percent playlist follow this link:
http://www.youtube.com/watch?v=do_IbHId2Os

Some decimals are easy to convert to fractions - you just put the decimal over a suitable multiple of ten - and then simplify from there. To do the more complex decimal to fraction conversions there is a trick, which involves some very easy algebra. Learn how to do this and you will be able to convert any decimal to a fraction.

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Exponent notation (also called index notation) is a shorthand way of writing repeated multiplication. The base is the number that is being multiplied and the exponent (index) is the number of time it is multiplied.

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

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You can subtract these sorts of questions easily and in you head in under 3 seconds. Seriously. You'll smash it.
Just remember...youtube and tecmath has your back - with this, the easiest subtraction trick you were EVER taught in school!
Numbers with zeros.

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#fastmathtricks
#mentalmath
#mathtrick Using math it can be proven that 2+2=5....although obviously there is a lie in there.
Use this math trick to fool your teacher, trick your friends or possibly get in an argument. Better yet learn how to avoid making these mistakes in your own reasoning.
Warning: anger will ensue.

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Dividing by multiples of 10 is simple to do.
First count the number of zeros in the number you are dividing by, then move the decimal place of the number being divided the same number of times.
Because we are dividing by numbers ten and above the answer is going to be smaller, and so the decimal place moves to the left. 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 algebra lesson looks at how to easily expand binomial expressions in brackets and simplify the result. Another easy math lesson.

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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 This math trick is pretty easy to do, and can be done in your head faster than a calculator.
This trick only works when multiplying numbers that both end in five. A couple of simple steps and you're done!
In addition, the mathematical reasons why this trick work are simply explained at the end of the video.

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Need to compare hourly rate to annual pay?
This math hack will allow you to do it instantly and easily - faster than you think!

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Percentage tricks: https://www.youtube.com/watch?v=8fG9nbVV9g4&list=PLjbxBzUM6SLn7pLTxrksJjlHoLY8aOcGk&index=7

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

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What is the chance of winning lotto?
What are the odds of picking the first three horses in a race?

This trick will have you working out the odds instantly!

Give you a hint if you want to win...don't bet! The maths is against you!

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

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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!

See more great math tricks here: https://www.youtube.com/user/tecmath

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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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On this lesson, you will learn the exponents rule for dividing exponents with the same base.

Join us on this flipped math lesson where we visually explore dividing exponents with the same base. For more MashUp Math content, visit http://www.mashupmath.com and join our free mailing list! :)

This lesson answers the questions: How do I divide one exponent by another? What are the laws of exponents? How do I divide exponents with the same base? How do I divide a power by a power?

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