These activities are great for the end of a unit or as an end of term math activity! The activity is targetted towards Year 3 to 8 students, however, some aspects may be particularly challenging for younger students. In the download, there is a page of recommended resources to provide for the students that may struggle.
Open-ended mathematics can enable children to stretch their abilities as far as they feel comfortable because they input the numbers into the problem, you only provide the context. These number problems act as projects for the children to work through and are generally very hands-on and integrated with a multitude of other applied skills. Students can work through the activities individually, in pairs or in groups and depending on their confidence they can also move onto the extension level tasks.
Teacher observations of these activities can be very interesting as certain skills they do not typically see of students in mathematics can be brought to light. It is also important to note that these problems give real-world context to mathematics, so steer away from procedural based knowledge application and instead encourage flexible application of conceptual thinking.