555

Do you want a quick math drill about the number 555, or something else (e.g., 555 timer IC, Roman numerals, etc.)?

Here are a few quick facts and a tiny practice set you can use for exam prep:

Quick facts about 555

• Factorization: 555 = 3 × 5 × 37
• Sum of digits: 5 + 5 + 5 = 15
• Divisible by: 3 and 5 (not by 9 or 11)
• Binary: 55510 = 1000101011₂
• Hexadecimal: 55510 = 0x22B
• Roman numeral: 555 = DLV

Tiny practice set

• Q1: Factorize 555. A: 3 × 5 × 37
• Q2: Convert 555 to binary. A: 1000101011₂
• Q3: Convert 555 to hexadecimal. A: 0x22B
• Q4: Write 555 in Roman numerals. A: DLV

Want more problems or a focus on a different subject? Tell me the topic and level, and I’ll tailor it.