Comment Re:Confusing symbols (Score 1) 1268
I remember seeing this kind of notation in my grade school textbooks. (I'm from Denmark by the way.)
Though usually it'd be presented with otherwise marked fields, rather than parentheses, and accompanied by short instructions. In earlier grades accompanied by a drawing representing the kind of problem solving needed, instead of written instructions. Like this:
Fill in the blanks, so both sides are equal:
4 + 3 + 2 = ___ + 2
In later grades, regular equation notation was then introduced, substituting x and y for blanks to fill in. Then you'd get a question like this:
Find the value of x in each equation:
4 + 3 + 2 = x + 2
x = ___