Hints for SUM #16

Difficulty: Hard

Spoiler-safe hints for the SUM puzzle of October 3, 2026. Each hint is hidden until you open it; the answer stays hidden until you ask for it.

Hint 1

Target 1 (45): start with 7 + 8 = 15

Hint 2

Target 2 (235): start with 3 × 7 = 21

Hint 3

Target 3 (657): start with 7 + 8 = 15

The answer

Contains the answer. Open only if you are stuck.

3 · 7 · 8 · 12 · 17

  • Target 1: 457 + 8 = 15 · 3 × 15 = 45
  • Target 2: 2353 × 7 = 21 · 12 × 21 = 252 · 252 − 17 = 235
  • Target 3: 6577 + 8 = 15 · 12 × 17 = 204 · 15 + 204 = 219 · 3 × 219 = 657

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SUM

Five numbers, four operations, three targets. Combine the numbers with + − × ÷ to hit each target exactly. The same puzzle for everyone, in every language.