Master Gmat Quant Number Properties Tricks with 161 free flashcards. Study using spaced repetition and focus mode for effective learning in Education.
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Divisibility by 3?
Sum of digits divisible by 3. E.g., 4521 → 4+5+2+1=12 → divisible.
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Divisibility by 3?
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Divisibility by 4?
Q · 3 of 161
Divisibility by 6?
Sum of digits divisible by 3. E.g., 4521 → 4+5+2+1=12 → divisible.
Last two digits divisible by 4. E.g., 1532 → 32 ÷ 4 = 8.
Even AND divisible by 3.
Last three digits divisible by 8.
Sum of digits divisible by 9.
Alternating sum of digits divisible by 11 (positive at odd positions, negative at even).
Whole numbers: 0, 1, 2, 3…
Integers: …, -2, -1, 0, 1, 2…
No. Smallest prime is 2; it's also the only even prime.
8: 2, 3, 5, 7, 11, 13, 17, 19.
Prime-factorize, add 1 to each exponent, multiply. 12 = 2² × 3¹ → (2+1)(1+1) = 6 divisors.
5^n cycle?5^1=5, 5^2=25, 5^3=125, 5^4=625, 5^5=3125. Last digit always 5.
7^n?Cycle of 4: 7, 9, 3, 1. So 7^25 → 25 mod 4 = 1 → last digit 7.
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