Abstrak: Tujuan penelitian ini adalah untuk mengetahui prosedur pengembangan alat peraga cobertif (corong berhitung aktif) dan untuk mengetahui kelayakan alat peraga cobertif (corong berhitung aktif) di MI Nurul Huda Pakuhaji Tangerang. Metode penelitian yang dipakai peneliti ialah Research and Development (R&D) model 4D (Four-D). Menurut Thiagarajan model 4D tersebut terdapat 4 tahap, yaitu tahap define (pendefinisian), tahap design tahap (perancangan), tahap develop (pengembangan), dan tahap disseminate (penyebaran). Dari data yang diperoleh dari pengembangan alat peraga cobertif ini mendapatkan jumlah skor keseluruhan dari beberapa ahli validasi sebesar 88,9% dengan kategori “Sangat Layak”. Hasil respon siswa sebesar 85% dengan kategori “Sangat Baik”.Abstract: The purpose of this study was to determine the procedure for developing cobertive teaching aids (active counting funnels) and to determine the feasibility of cobertive teaching aids (active counting funnels) at MI Nurul Huda Pakuhaji Tangerang. The type of research used by the researcher is Research and Development (R&D) 4D (Four-D) model according to Thiagarajan's theory, namely define (definition), design (design), develop (development), and disseminate (dissemination). The type and model of this method was chosen because this development model is more effective for developing learning tools. From the data obtained by this cobertif teaching aid, the total score from several validation experts is 88.9% so that it gets the Very Eligible category.