555

Not sure what you need with just “555.” If you want a quick practice set, here are a few mini-questions themed around the number 555 (good for quick exam warm-ups):

• Factorize 555. What are its prime factors? Answer: 555 = 3 × 5 × 37

• Digit-related: what are the sum and the product of the digits of 555? Answer: sum = 15; product = 125

• Divisibility: is 555 divisible by 3, 5, both, or neither? By 9? Answer: divisible by 3 and 5 (and 15), not by 9

• Roman numerals: how do you write 555 in Roman numerals? Answer: DLV

• Base conversions: what is 555 in binary? and in hex? Answer: binary = 1000101011, hex = 0x22B

If you’re studying a specific subject (calculus, stats, physics, CS, etc.), tell me and I’ll tailor a set of questions. Want a longer quiz or a particular topic? I can generate it.