This study explores which methods Swedish students use for multi-digit addition and subtraction after being taught the simplification methods regroup and move the difference. The data consist of 30 students’ solutions to one subtest of the Grade 3 national mathematics test. Results show that students used a variety of methods, with splitting numbers by place value being the most common, despite having lower success rates. The simplification methods were used less frequently, but more successfully. The findings suggest that conceptually focused teaching of different methods can support students in selecting and using efficient methods, although additional support may be needed to increase actual use. The study also confirms earlier research showing that Stepwise methods outperform Split methods, especially in subtraction.