555

Not sure what you mean by "555." Do you mean:

• the number 555 for a quick math warm-up, or
• the 555 timer IC, or
• you’re just joking?

If you want a quick math warm-up using 555, here are a few problems you can try:

• Prime factorization: 555 = 3 × 5 × 37
• List all positive divisors: 1, 3, 5, 15, 37, 111, 185, 555
• Remainder when dividing by 8: 555 mod 8 = 3
• Solve a congruence: find x such that 555x ≡ 1 (mod 7). Since 555 ≡ 2 (mod 7), this is 2x ≡ 1 (mod 7) → x ≡ 4 (mod 7)

Want more problems or a different topic (e.g., physics, chemistry, calculus) for exam prep?