MindProofA different way to think.
Target Number
Four numbers. One target. Combine them your way and see a worked solution.
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12 puzzles with explanations
How to play ↓target-v1-004Easy
Target Number: 20
1247
Use each number exactly once. You may use +, −, ×, ÷ and parentheses. Fractions and negative intermediate results are allowed. You cannot join digits or use powers.
A small hint
Try doing a small calculation inside parentheses first.
One possible solution
(7+4-1)×2 = 20
- 7 + 4 = 11
- 11 − 1 = 10
- 10 × 2 = 20
Read the solution
(7+4-1)×2 = 20
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How to play
Try grouping numbers with parentheses. A correct answer may differ from the example: every valid expression that reaches the target is accepted.
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