If you're looking for some testing, open-ended, problem-solving questions to get the confident mathematicians in your class applying and discussing their understanding of addition and subtraction, try this Year 3 3-Digit Numbers and Tens challenge activity! It works wonderfully as a group discussion task, either between children or with an adult working as a discussion partner. It can also be done by an individual.

Use it as school or homework, and be sure to make use of the example answer sheet we've included. It will help you or your pupils to quickly check that their answers are on the right lines!