161 cards
This deck is packed with quick-reference shortcuts for handling number properties questions on the GMAT Quant section. You'll find fast divisibility rules for common divisors like 3, 4, 6, 8, 9, and 11, along with handy reminders about primes, integers, and whole numbers. There are also clever pattern-recognition tricks, such as the cyclicity of the last digit of powers of 7 and the digit-sum behavior of powers of 5, plus classic formulas for the sum of the first n integers and the sum of the first n squares.
It's a great fit if you're preparing for the GMAT and want to shave seconds off your problem-solving pace, or if you're simply brushing up on foundational number theory for any standardized math exam. Even if you already know the basics, these bite-sized cards can serve as a refresher for those moments when a divisibility rule or divisor-counting shortcut slips your mind under pressure.
To get the most out of these cards, try spacing your review sessions across several days rather than cramming everything at once, since pattern-based tricks tend to stick best with repeated, short exposures. As you study each rule, pause to think of a quick example in your head — for instance, applying the divisibility-by-11 check to a number like 1,221 — so the logic behind the shortcut becomes automatic rather than memorized.