The challenge for teachers during this pandemic is to continue to provide quality learning for their students. All forms of learning that were initially carried out face-to-face must now turn to online learning. One form of learning that is considered effective to be given online is by giving powerful and meaningful tasks. This article aims to describe the task design to develop mathematics learning tools that contain creativity and innovation, critical thinking and problem solving, collaboration, and communication, or what is often referred to as 4C skills. The design of these tasks is delivered using google classroom as the Learning Management System, synchronously, and asynchronously. The tasks are developed by following the ADDIE (Analysis, Design, Develop, Implement, and Evaluate) model, which in this article reaches the Develop stage. The complete task designed consists of the activities of: 1) explaining the 21st Century Learning framework simply by showing the 4C's position in it; 2) analyzing math learning activities that provoke 4C skills; 3) developing 4C skills assessment rubric, and 4) designing math instructional tools that contain 4C. Furthermore, the task designed will be validated and tested on mathematics education students who have taken the course that supports the development of the instructional tool such as innovative learning, assessments, learning media, and others.