Once your children are fluent with subtracting across a hundred, challenge their thinking with this Year 3 Subtract 10s Across a 100 Reasoning and Problem Solving resource. The questions are differentiated to three levels of challenge, helping you to deliver a great lesson to every child in your class. To help reduce the time it takes to mark all of their work, we have included an answer page that is easy to use and understand. You could even encourage your children to mark their own work, or that of a partner.