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Maths Hack: 12 Useful Math Hacks That They Didn't Teach You In School

After finding these math hacks, I'm convinced that all those years of being forced to struggle through math class really was just a t...

After finding these math hacks, I'm convinced that all those years of being forced to struggle through math class really was just a torture ploy created by evil math teachers everywhere. Check out these amazing math tips and you'll agree! Watch out though, you may just unleash the inner math which you never knew was in you...

1. How To Convert Fahrenheit to Celsius

As if it was this simple all along...

2. How To Multiply Large Numbers In Your Head 

Who knew?




3. How To Multiply By 11 
Finally! I can now multiply more than single digits by 11 in my head.

 
4. Secret To Remembering The Numbers In Pi
Also a cool party trick.


5. How To Find Fractions Of Whole Numbers 


6. How To Figure Out What Day Of The Week Falls On What Date...

You might be confused looking at the picture below, but the math is actually quite simple (albeit a bit elaborate).

July simply has a code of 5.
20th is 6 because 7 goes into 20 twice, which is 14. 20 - 14 = 6.
2069 is 2 because the leap year code of 2068 is 1 and 2069 is 1 year after, so that's 2.

The math can be difficult at first because there are a lot of codes, but it works out incredibly well once you pick it up. Here's a separate example:

January 3, 2014 is a Friday, right?

So, January, according to the table, is 6, and we handle days by using multiples of 7. We don't need to, so it's actually just 3 in this case. Next we need to know the closest leap year, which was 2012. That has a year code of 1 and 2013 is 2 years after, so 3 again.

We get 6 + 3 + 3 = 12 - 7 = 5! FRIDAY!



7. How to Add And Subtract Fractions

8. How To Figure Out Multiples Of Nine

Just count up in the tens column and down in the ones column.


9. How To Use Your Hands For 5, 6, and 9 Times Tables

Step 1

Choose the numbers to multiply.Example: 7x8

Step 2

Put together the fingers whoses values you want to multiply.

Step 3

Now count the touching fingers and the ones below them. The number you get will be the tens. Example: 5

Step 4

Now multiply the fingers above the ones touching of the left hand and the ones in the right hand. The number you get will be the units. Example: 3x2=6

Answer: 56

**In some cases you will get a number of units bigger than nine, in that case sum both quantities**

Example: 7x6

- Touching fingers + the ones below  ->  3

- Fingers above the ones touching in left hand  ->  3
                                                                                                               3 x 4 = 12
- Fingers above the ones touching in the right hand  ->  4


                                                                                3        (tens)
Now we've got 3 tens and 12 units  ->                  + 12      (units)
                                                                             ---------
                                                                                  42     (final result)


Here's an extra trick for the whole table of nine.

- First put your hands in front of you
- Then ascribe values from 1 to 10 to your fingers
- Fold the finger whose value you want to multiply nine times
- The fingers remaining unfolded in the left will be the tens
- The fingers remaining unfolded in the right will be the units


Example:  9 x 4

- Fold the fourth finger
- Fingers remaining unfold in the left  ->  3  (tens)
- Fingers remaining unfold in the right  ->  6 (units)
- Final result  ->  36‎




10. How To Figure Out Percentages

11. How To Remember Which Sign Is Greater Than and Which Is Less Than

Alligator always eats the bigger number!
4 Likes

12. Use Lines To Multiply

The is actually a method used often by the Japanese.

Still don't have it? Here are three awesome sources that will teach you:

(1) Lifehacker
(2) WikiHow
(3) Magical Maths‎





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