555

Not sure what you need with “555.” If you’re just testing, here are quick math notes you can use for exams:

• Factorization: 555 = 3 × 5 × 37 (also 15 × 37)
• Divisibility: divisible by 3 (sum of digits = 15) and by 5; so divisible by 15 as well
• Simple quotients: 555 ÷ 3 = 185; 555 ÷ 5 = 111; 555 ÷ 37 = 15
• Bases: hex 0x22B, binary 0b1000101011, octal 0o1053
• Quick practice problem: gcd(555, 1000) = 5

If you’re studying a specific subject, tell me the course and level and I’ll tailor a short practice set or a quick explanation.