Despite the widespread use of mobile digital devices such as iPads in teaching and learning, there is little research on the ways in which content teachers make use of the technological affordances of the iPad to achieve pedagogical goals in bilingual/multilingual classrooms. This article adopts translanguaging as an analytical perspective to explore how the use of the iPad extends the semiotic and spatial repertoires for enabling the English Medium Instruction (EMI) teacher to create a translanguaging space for supporting multilingual students' learning of new academic knowledge. The data for this article is based on a linguistic ethnographic project in an EMI mathematics classroom in a secondary school in Hong Kong. Multimodal Conversation Analysis is used to analyse the classroom interactional data, triangulated with the video-stimulated-recall-interviews that are analysed using Interpretative Phenomenological Analysis. The article argues that the iPad provides opportunities for the EMI teacher to fully exploit the semiotic and spatial resources for creating a technology-mediated space in the classroom. Such a space in turn allows the teacher to accomplish content teaching and build a more engaging environment for learning.