Early school math olympiads often insolve problems of the following type:
Given 1 _ 2 _ 3 = 2, replace _ by a + or a -.
This MATLAB demo generates such problems. You can vary the number of operands, their numeric size (i.e. how big the numbers are) and what operands (+, -, /, etc.) are supported.
Dmitri (2020). Insert-an-operator Generator (https://www.mathworks.com/matlabcentral/fileexchange/45823-insert-an-operator-generator), MATLAB Central File Exchange. Retrieved .