555

Not sure what you want with “555.” Here are a few quick math facts and some practice prompts you can use for exams. Tell me your subject and I’ll tailor it.

Quick facts

• Prime factorization: 555 = 3 × 5 × 37
• Divisible by: 3, 5, 15, 37, 111, 185, 555. Not divisible by 9 or 11.
• Roman numeral: DLV
• Binary and hex: 555 = 1000101011 in binary; 0x22B in hex

Quick practice prompts

• Solve for x: 3x + 555 = 0 → x = -185
• If a sequence is arithmetic with first term a1 = 555 and common difference d, write the nth term: a_n = 555 + (n-1)d
• Compute modular arithmetic: 555 mod 7, 555 mod 9
• Convert between bases: write 555 in binary and in hex (as above)

If you tell me your course (e.g., number theory, algebra, computing, etc.) I’ll give you targeted questions and step-by-step solutions.