Hints for SUM #29

Difficulty: Medium

Spoiler-safe hints for the SUM puzzle of October 16, 2026. Each hint is hidden until you open it; the answer stays hidden until you ask for it.

Hint 1

Target 1 (40): start with 1 + 9 = 10

Hint 2

Target 2 (217): start with 1 + 30 = 31

Hint 3

Target 3 (350): start with 9 + 30 = 39

The answer

Contains the answer. Open only if you are stuck.

1 · 2 · 9 · 18 · 30

  • Target 1: 401 + 9 = 10 · 30 + 10 = 40
  • Target 2: 2171 + 30 = 31 · 9 − 2 = 7 · 31 × 7 = 217
  • Target 3: 3509 + 30 = 39 · 18 ÷ 2 = 9 · 39 × 9 = 351 · 351 − 1 = 350

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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.