However, in spite of the importance of multiplicative thinking, several studies have reported students’ difficulties with multiplication learning (Siemon & Virgona, 2001). For instance, Clark and Kamii (1996) found that even more than half of the 5th graders who learned multiplication more than 3 years could not demonstrate solid multiplicative thinking. Other studies also reported that one of the most frequent errors in solving multiplication problems was students’ incorrect use of addition. From these results, transition from additive to multiplicative thinking is likely to be a hard work for students.