Math memorization

[Addallat]

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What are some simple math that you guys have committed to memory to make the math on mcat go by much faster ?

e.g
knowing right off the bat that

sin 45 is root2 /2
so committing to memory
root 2 = 1.41 and subsequently /2 is .71

or

someone else mentioned they memorized the squares of every number from 10 to 25

 

[sakabato93]

What are some simple math that you guys have committed to memory to make the math on mcat go by much faster ?

e.g
knowing right off the bat that

sin 45 is root2 /2
so committing to memory
root 2 = 1.41 and subsequently /2 is .71

or

someone else mentioned they memorized the squares of every number from 10 to 25

Memorize common trig ratio values:

sin(0)=0
sin(30)=1/2
sin(45)=root2/2
sin(60)=root3/2
sin(90)=1

And the cos/tan for the same numbers as well.

Also, remember root2=1.414 and root3= 1.7...something.

I think that's all I'd recommend. As for the squares, I think that's needless. Multiplying two-digit numbers is not that tedious. But, if you are concerned, then do it.

 

[rfvbnmju]

I also memorize log 2 = .3 and log 3 =.45. There's a section in BR chem that shows you how to find pH = -log [H+] pretty quick and accurately.

 

[mehc012]

Since my exam isn't for a year and it would be silly to start straight-up content review now, I've been trying to work on my mental math skills (probably my biggest downfall in general academically). So I personally have made an Anki deck for:
All unit fractions up to 1/12
Square roots of 2, 3, 5, and 7
Log rules - e.g. log(ab) = log(a) + log(b)
-Log(3*10^-x = x-0.5)
Trig values: sin and cos of 0,30,45,60,90
Basic exponent rules

It's not that many cards, but with that info you can estimate almost any equation you're asked to solve!