555

Do you want to work with the number 555 in a math problem, or is this a Thai “555” joke? If you’re doing exam prep, here are quick math facts and handy prompts:

Quick facts

• Prime factorization: 555 = 3 × 5 × 37
• Divisors: 1, 3, 5, 15, 37, 111, 185, 555
• Sum of digits: 15 → divisible by 3 and 5; not by 9
• Simple products: 555 × 7 = 3885; 555 ÷ 15 = 37

Five quick practice prompts (easy to adapt to your topic)

• Factorize 555 (answer: 3 × 5 × 37)
• Compute 555 × 12
• Compute 555 ÷ 15
• Determine 555 mod 9
• If a item costs 555 and is discounted by 10%, what is the sale price?

If you tell me the exact topic (factorization, divisibility, modular arithmetic, algebra, etc.), I can tailor a short set of exam-style problems around 555.