A simple PowerPoint with addition and subtraction calculation questions that provide pupils with the opportunity to practise their written methods. For the first activity the 10 questions get progressively harder and I used this as an assessment to identify gaps and group pupils accordingly for teaching input. I repeated these questions at the end of the unit to assess progress and next steps. The second activity includes 13 questions that are grouped in three categories of difficulty. There are two further reasoning activities to consolidate the learning.