In this paper, we report on the cross-cultural comparative analysis that was undertaken as part of the Social Unit of Learning project investigating student collaborative problem solving in China and Australia. The video-based research examined the 'negotiative foci' of dyadic student interaction during collaborative problem solving within the mathematics classroom setting. In the analysis we take "negotiative focus" as the central construct and compare the student interactions in terms of their focus on either facts and procedures, didactical norms, or social/interpersonal considerations. We report on the analysis based on an open-ended pair task (Household task) that was completed by year 7 students (mostly 12- to 13-year olds) in China and Australia. In the study we analysed the video and written responses of 20 student pairs from three year 7 classes in China (40 students in total) and 25 student pairs from two year 7 classes in Australia (50 students in total). The findings from this comparative study provide empirical evidence regarding how the participating students in each country interpreted and negotiated meaning as they tackled the open-ended task collaboratively.