Mathematics Hack Part 5 of 5

In the last part of the mathematics hack, here's how you convert Deg F to Deg C and vice versa

(Image taken from the internet and credits belongs to their owner)

For mental calculation, using mutiples of 2 and adding 30 make things so much easier. 

Of course you have a calculator or phone with a calculator, you can get more accurate conversion by just adding / subtracting 32 and multiply / divide by 1.8. 

Mathematics Hack Part 4 of 5

We all know multiples of 10 is easy but one digit before and after 10 is hard. 

So here's the hack how you multiply 9 and 11 

Multiply using 9

Multiply using 11 

Another example: 

63 x 11

6   3

6+3=9

So answer is 693

(Images taken from the internet and credits belong to their owners)

Mathematics Hack Part 3 of 5

Mathematics Hack time again.

Here's the hack how to remember the value of Pi.

(Taken from the internet, image credit to its owner)

Mathematics Hack Part 2 of 5

It's time for Mathematics Hack again.

Bad at multiplying single digit especially the bigger numbers?

Actually, you have it on your hands:

Another example:

6 x 9 (last finger on your left hand touches index finger on your right hand

So below (including the 2 touching fingers is 5 fingers, and this is tens, so it is 50  

And above (units) is 4 x 1 = 4 

Answer will be 54.

(Images taken from the internet and credits belongs to their owners)

Mathematics Hack Part 1 of 5

Happy New Year 2015, everyone. 

To start off the New Year, I will be coming out with a series of useful Mathematic hack. Those mathematic stuffs that you don't learn in school but prove to be very useful in life later.

Here's one to start off with, I have about will update one every 3 days. Enjoy

How to multiply large numbers

(Source: Taken from the internet)

Try it, it works.

I give another example: Say 95 x 95 

So 100-95 = 5 and 5+5=10 

So we know the first 2 numbers of the answer is 100-10= 90

And last 2 numbers of the answer is 5 x 5 = 25

So the answer is 9025.