Hints for SUM #21

Difficulty: Easy

Spoiler-safe hints for the SUM puzzle of October 8, 2026. Each hint is hidden until you open it; the answer stays hidden until you ask for it.

Hint 1

Target 1 (89): start with 8 × 10 = 80

Hint 2

Target 2 (128): start with 3 + 9 = 12

Hint 3

Target 3 (332): start with 3 + 10 = 13

The answer

Contains the answer. Open only if you are stuck.

3 · 8 · 9 · 10 · 75

  • Target 1: 898 × 10 = 80 · 9 + 80 = 89
  • Target 2: 1283 + 9 = 12 · 10 × 12 = 120 · 8 + 120 = 128
  • Target 3: 3323 + 10 = 13 · 8 + 75 = 83 · 13 − 9 = 4 · 83 × 4 = 332

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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.