These open-ended Hundreds Chart Challenges (Year 1-6) will strengthen your students’ number sense, place value understandings and their ability to problem solve and reason. We have provided 10 different task cards that include 100s chart challenges, 200s chart challenges and decimal challenges, suitable for students across Year 1 to Year 6. Use these task cards as a warm up/fluency task, during a mini lesson alongside a ‘think aloud’ or as an independent or collaborative task. Encourage your students to find multiple solutions or prove that they have found ALL of the possible solutions.