Mathematics - Addition and Subtraction - Multi-digit addition and subtraction - Column-by-Column Solver

Show 3-4 digit addition and subtraction problems in vertical format. The student fills in each column's answer one at a time, right to left. Include carry/borrow indicators. 10 problems: 5 addition (some with multiple carries), 5 subtraction (some with borrowing across zeros). Examples: 3,456+2,789;