Its handy to know 6ths 7ths and 8ths but they require more memorization and dont come up as often. 37 037 37100. 19 11 repeating 29 22 repeating etc.
To achieve a good score on the math section it is essential that you memorize the necessary GMAT math formulas.
Practice every day to prep for the test and get a better quant score. How many formulas and equations do you have to memorize. Distance Rate x Time. Area of Circle pi r2 Perimeter of Circle 2 pi r Where 𝒓 Radius d Diameter d 2𝒓.