Kemampuan numerasi siswa SD masih tergolong rendah, terlihat dari hasil observasi di SDN Manukan Kulon VI yang menunjukkan tidak ada siswa mencapai nilai sempurna.Tujuan utama adalah mengetahui penguatan kemampuan numerasi siswa melalui pembelajaran inovatif Contextual Teaching and Learning (CTL) berbasis budaya lokal dengan memanfaatkan permainan tradisional dakon pada materi Kelipatan Persekutuan Kecil (KPK). Penelitian kuantitatif ini mengadopsi desain pre-eksperimen dengan model One Group Pretest-Posttest Design dan melibatkan 30 siswa kelas V-A SDN Manukan Kulon VI. Data dikumpulkan melalui pretest dan posttest dengan instrumen yang berupa soal uraian berdasarkan indikator numerasi. Temuan penelitian menunjukkan adanya kenaikan rata-rata skor dari 53,8 pada pretest menjadi 81,6 pada posttest. Perbedaan signifikan antara hasil pretest dan posttest ditunjukkan oleh nilai thitung 9,961 dan signifikansi 0,000 dari uji paired sample t-test dengan selisih rata-rata sebesar -27,867. Pembelajaran CTL berbasis budaya lokal terbukti memperkuat kemampuan numerasi dan menjadikan pembelajaran lebih kontekstual dan bermakna. Elementary school students' numeracy skills are still relatively low, as seen from the results of observations at SDN Manukan Kulon VI which showed that no students achieved perfect scores. The main objective was to determine the strengthening of students' numeracy skills through innovative Contextual Teaching and Learning (CTL) learning based on local culture by utilizing the traditional dakon game on the Smaller Multiples (KPK) material. This quantitative study adopted a pre-experimental design with the One Group Pretest-Posttest Design model and involved 30 students in grade V-A of SDN Manukan Kulon VI. Data were collected through pretest and posttest with instruments in the form of descriptive questions based on numeracy indicators. The research findings showed an increase in the average score from 53.8 in the pretest to 81.6 in the posttest. The significant difference between the pretest and posttest results was indicated by the t-test value of 9.961 and a significance of 0.000 from the paired sample t-test with an average difference of -27.867. CTL learning based on local culture has been proven to strengthen numeracy skills and make learning more contextual and meaningful.