On the Subject of Four Operands

Oh come on, you’ve done worse than this.

Use the operators at the bottom of the module to complete the math expression and make it equal to the number at the top.

Pressing an operator will set it at the leftmost empty slot in the expression. Press a set operator to remove it.

The module automatically submits your answer after placing all operators. A wrong answer will remove them and cause a strike. A right answer will disarm the module.

Operators are evaluated from left to right (multiplication and division don’t take priority).

For subtraction and division, the bigger operand should always be interpreted as the left one. For divisions, drop the result’s decimals.