555

Do you want help with the number 555 (math problems), or did you mean the Thai internet slang “555” (laughing)? Here are quick math notes in case that’s what you need:

Quick facts about 555

• Decimal factorization: 555 = 3 × 5 × 37
• Divisibility: divisible by 3 and by 5; not divisible by 9, 11, or 7
• Roman numeral: 555 = DLV
• Binary: 555 = 1000101011₂
• Hex: 555 = 0x22B
• Base-6 to decimal: 555₆ = 5×36 + 5×6 + 5 = 215

Practice problems you can try

1. Verify factorization: 555 = 3 × 5 × 37 (show step)
2. Compute gcd(555, 420) and lcm(555, 420)
3. Convert 555 to binary (done above, but write out the steps)
4. Convert 555 to hex (done above, show the division by 16 to get 0x22B)
5. Express 555 as a sum of consecutive integers (optional; this is a bit trickier)

If you meant something else by 555, tell me what you’d like (e.g., more practice, a specific type of problem, or the Thai “555” joke).