This study examined problem-based learning in blended learning classrooms for practicing mathematical problems in an emergency situation, such as Covid-19. For this purpose, a three-week program was framed in contrast to traditional teaching, aiming at enrichment and not remediation, for a group of fifty students' studying mathematics in a science program. The formative experiment research method was used for this study and practiced at public sector Higher Secondary School in Jehangira, district Swabi. The data were collected through a self-developed questionnaire verified by experts and were analyzed by using simple frequency distribution. Findings were mostly positive, indicating that students found problem-based learning productive in practicing mathematics, for example, solved samples helped them in answering similar problems, course work was completed timely, and use of smartphones with peers in groups helped them in better understanding the problems. The findings also revealed some concerns such as poor availability of network/internet services or non-affordability of having smart phone or internet packages, and parents' unwillingness for allowing smartphones and using the internet.