Mathematical · hard difficulty

NumberBox practice game

Combine four numbers with whole-number arithmetic to reach the target. Practice 10 puzzles free with no account required.

• Combine the four given numbers with +, -, ×, and ÷ to reach the target
• Each operation consumes the two selected numbers and replaces them with its result
• Division must be exact: every division result must be a whole number
• Plan short operation chains before committing the first pair
• Spot factors and exact divisions that create useful intermediate numbers