Pelea de internet.
HOW DID I NOT KNOW THIS?!
Why do I learn more about math from Tumblr than my 12+ years of formal education????????
No math teacher ever taught me this trick. Got damn.
This is great and all if you know how to subtract things from 100
This would have been helpful a few days ago before I had my maths exam
No se consuela quien no tiene un amigo con ideas absurdas