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

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Post time 20-2-2015 02:43 PM | Show all posts |Read mode
Edited by abgsedapmalam at 20-2-2015 06:12 PM



L.Glee for Did you know?



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 whiz you never knew was in you...


1. How To Convert Fahrenheit to Celsius

As if it was this simple all along...


via reddit/u/quaxon






2. How To Multiply Large Numbers In Your Head Who knew?


via imgur / MoonnMan


3. How To Multiply By 11

Finally! I can now multiply more than single digits by 11 in my head.


via WonderHowTo



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

via 1000lifehacks


5. How To Find Fractions Of Whole Numbers

via imgur / ayounes



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). You'll need the codes HERE, which will help you master this.

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!

via lifehacker





7. How to Add And Subtract Fractions

via imgur / ayounes



8. How To Figure Out Multiples Of Nine Just count up in the tens column and down in the ones column.

via Pinterest / Charles Stirton





9. How To Use Your Hands For 5, 6, and 9 Times TablesClick HERE for more detailed instruction...

via instructables / misko13



10. How To Figure Out Percentages
via Twitter / @LifeHacks







11. How To Remember Which Sign Is Greater Than and Which Is Less ThanAlligator always eats the bigger number!

via ducksters



12. Use Lines To Multiply
via school-exercise-books

The above is actually a method used often by the Japanese. Here is video demonstrating:




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

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


Main Image Source: imgur / MoonnMan
Collage Source: 1.  imgur / ayounes2. school-exercise-books3. lifehacker



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Post time 20-2-2015 02:51 PM | Show all posts
Info yang sangat menarik







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Post time 20-2-2015 04:17 PM | Show all posts
Mohon share ye bangsedap..
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Post time 20-2-2015 05:17 PM | Show all posts
apsal la dlu mase sekolah x tau pasal ni?
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Post time 20-2-2015 10:27 PM | Show all posts
Menarik infonya
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Post time 20-2-2015 10:28 PM | Show all posts
Menarik infonya
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Post time 20-2-2015 10:28 PM | Show all posts
Menarik infonya
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Post time 21-2-2015 12:12 AM From the mobile phone | Show all posts
Interesting...
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Post time 21-2-2015 04:11 AM | Show all posts
wow this is great
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Post time 21-2-2015 08:25 AM | Show all posts
interesting...semua masalah ada penyelesaiannya
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Post time 23-2-2015 09:05 AM | Show all posts
kalo tau zmn skola dlu msti keputusan cemerlang
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Post time 23-2-2015 04:40 PM | Show all posts
anees~nuhara replied at 23-2-2015 09:05 AM
kalo tau zmn skola dlu msti keputusan cemerlang

setuju ngan michael
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Post time 24-2-2015 11:32 AM | Show all posts
cikgu math patut ajar formula ni dulu2
baru la tak bosan
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Post time 24-2-2015 12:08 PM | Show all posts
wow.. menarik..
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Post time 24-2-2015 04:39 PM | Show all posts
menarik2....
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Post time 25-2-2015 09:44 AM | Show all posts
menarik.. kalau masa sek dulu ajar fomula ni xde lah rasa mcm nak ketuk kepala sendiri
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