555

Could mean a few different things. Here are quick notes:

• Decimal 555: composite, factors = 3 × 5 × 37
• Roman numerals: 555 = DLV
• Binary: 555 = 1000101011₂
• Hexadecimal: 0x22B
• Base-6: 2323₆
• If you’re thinking of the 555 timer IC, I can cover its basics (astable vs monostable) and make a practice question.

What would you like me to do with 555 for your exam prep? Choose one:

• Do a quick conversion or factorization exercise
• Create a short problem set on numeral systems
• Explain the 555 timer (and give a practice question)