There's a very old math algorithm called Euclid's Algorithm that lets you slowly work your way down to the greatest common factor between two numbers regardless of size. It's quite simple but requires a lot of subtraction.
You see that both numbers end with an even number and divide by 2 … 8 times. 2 is one of the easiest common divisors to find. Along with /10 if both end with 0 or /5 if one ends 5 and the other 5 or 0. In this case it’s a lucky example, usually you don’t find the GCD with just dividing by 2. But you actually only asked about common divisors and you can see 2, 5 and 10 in decimal
I love reducing fractions, because I’m way too lazy to do mental calculations with big numbers. You can reduce in multiple steps.
I was even so lazy to first write 3.5 3.5 2 0.5 2 2 / 2 1.5 2.5 1 = 1.5 4 3.5 0 3.5 1 / 1 0.5 3.5 3 … (then wrote it without the space, but then you have to know that .NM has to be replaced with N+M; it was less to type). I only did the last step fully in my head
It boggles the mind how many people are openly, almost proud, of being bad at math.
They teach third graders how to reduce fractions. An average adult brain should be able to look at a fraction and intuitively figure out how to reduce it. using a calculator, at the very least.
This should be on par with not knowing how to read.
18 Comments
sp3ctr4l@lemmy.dbzer0.com · 17 pts · 57d
... of all the memes here I have so far seen on this comm...
Yep. 100% this one.
... and I am a fucking data analyst and progammer.
Fraction reduction is can actually be... quite complicated...
[vomits, adorabley]
guynamedzero@piefed.zeromedia.vip · 9 pts · 57d
Reduce this fraction -> 774144/4352
brookedSmile@lemmy.blahaj.zone · 9 pts · 57d
Or 3024/17
kewwwi@lemmy.world · 9 pts · 57d
meanies
brookedSmile@lemmy.blahaj.zone · 4 pts · 57d
I only cried for 5 minutes answering that 😂
lyralycan@sh.itjust.works · 6 pts · 57d
How the hell does a human and/or calculator find the common divisor??
djsoren19@lemmy.blahaj.zone · 7 pts · 57d
There's a very old math algorithm called Euclid's Algorithm that lets you slowly work your way down to the greatest common factor between two numbers regardless of size. It's quite simple but requires a lot of subtraction.
brookedSmile@lemmy.blahaj.zone · 5 pts · 57d
https://www.mathsisfun.com/numbers/common-denominator.html
Also
https://www.mathsisfun.com/least-common-denominator.html
Math is hard lol
z3rOR0ne@lemmy.ml · 2 pts · 56d
Euclid's Algorithm.
basxto@discuss.tchncs.de · 1 pts · 48d
You see that both numbers end with an even number and divide by 2 … 8 times. 2 is one of the easiest common divisors to find. Along with /10 if both end with 0 or /5 if one ends 5 and the other 5 or 0. In this case it’s a lucky example, usually you don’t find the GCD with just dividing by 2. But you actually only asked about common divisors and you can see 2, 5 and 10 in decimal
I love reducing fractions, because I’m way too lazy to do mental calculations with big numbers. You can reduce in multiple steps.
774144/4352=387072/2176=193536/1088=96768/544=48384/272=24192/136=12096/68=6048/34=3024/17
I was even so lazy to first write 3.5 3.5 2 0.5 2 2 / 2 1.5 2.5 1 = 1.5 4 3.5 0 3.5 1 / 1 0.5 3.5 3 … (then wrote it without the space, but then you have to know that .NM has to be replaced with N+M; it was less to type). I only did the last step fully in my head
lyralycan@sh.itjust.works · 2 pts · 48d
That's so cool! Thanks for helping me! I can barely mimic a fraction
brookedSmile@lemmy.blahaj.zone · 6 pts · 57d
177 and 15/17!!
CombatWombat@feddit.online · 7 pts · 57d
Hell I don't even remember what reducing a fraction is anymore. If I start with 12/10, is the correct answer 6/5 or 1 1/5?
brookedSmile@lemmy.blahaj.zone · 13 pts · 57d
Both are correct, depends on the requirements of what your doing
SpaceNoodle@lemmy.world · 8 pts · 57d
6/5, common notation is ideal for math. Mixed numbers are only useful for recipes in US customary units.
sp3ctr4l@lemmy.dbzer0.com · 8 pts · 57d
Yes
subverted_per@lemmy.blahaj.zone · 4 pts · 57d
No, no, no you got three fractions there. You have to reduce, get it down to one clean looking one like that 1 1/5. Toss those other two.
BodePlotHole@lemmy.world · 7 pts · 55d
It boggles the mind how many people are openly, almost proud, of being bad at math.
They teach third graders how to reduce fractions. An average adult brain should be able to look at a fraction and intuitively figure out how to reduce it. using a calculator, at the very least.
This should be on par with not knowing how to read.