555

Not sure what you want with “555.” Do you mean the number for a quick math problem, or are you just joking (555 is often used as laughter in Thai internet slang)? If you’re studying, tell me the subject and level and I’ll tailor it. In the meantime, here are a few quick math notes you can use:

• Factorization: 555 = 3 × 5 × 37
• Divisibility: 555 is divisible by 3 and 5, but not by 9 or 11.
• Digit stuff: sum of digits = 5 + 5 + 5 = 15; product of digits = 125.
• Quick practice problem: Factor 555 (answer: 3 × 5 × 37). Or find gcd(555, 12345) (answer: 15).

If you want, tell me the topic (algebra, calculus, stats, physics, etc.) and I’ll give you a short practice set.