Use this fluency matrix to ensure children understand how addition and subtraction are inverse, and how that fact can be used to check calculations.

This Year 4 Inverse Operations Fluency Matrix uses nine questions that gradually increase in difficulty so that children can flex their understanding of inverse operations. Many questions have multiple parts so that they are stretched, and all answers are provided!

Other resources are available to consolidate learning further: a reasoning and problem solving worksheet, a varied fluency worksheet and a discussion problem.