This study explores factors that influence teachers' technology adoption in technology-rich classrooms and how they interact by integrating task technology fit into the Technology Acceptance Model (TAM). A proposed model was tested via 343 survey responses from Grade 1-12 teachers using structural equation modeling. The results indicated technology task fit played an essential role in teachers' technology adoption in technology-rich classrooms. Perceived ease of use, however, did not influence teachers' intention to use technology as previously predicted. The findings suggest that to promote technology adoption in teaching, it is important to help teachers integrate technology into their instructional design and create a supportive culture with sufficient technological support.