“…Thisresults are confirmed by some researches conducted by Gani, Yusuf, andErwina (2017), Susanty, (2016), Isnawan and Zahroni (2016), Zaqiyaturrahmah (2018), Manurung, Samosir, Hia, Mariani, Togi & Tambunan (2019), Mufida (2021), Wirawan, Rita, and Waris (2013), Sipayung, Gusar, Siahaan, Purba, Haloho (2021). Regarding student math achievement, the leadership strategy (snowball-throwing collaborative learning and traditional) is effective, and the snowball-throwing kind of collaborative learning is more effective than the traditional approach.…”