Add two 3-digit numbers. The numbers are automatically transferred into column format, but no hints are provided
A. Add 2-digit numbers using the standard algorithm with regrouping
B. Add 2-digit numbers using the standard algorithm with regrouping to solve word problems
C. Add 3-digit numbers using the standard algorithm with regrouping (Level 1)
E. Add 3-digit numbers using the standard algorithm with regrouping to solve word problems (Level 1)
F. Add 3-digit numbers using the standard algorithm with regrouping to solve word problems (Level 2)
G. Add 3-digit numbers using the standard algorithm with regrouping (Level 3)
H. Add 3-digit numbers using the standard algorithm with regrouping to solve word problems (Level 3)