Moving on to the Year 4 Add Two Four-Digit Numbers One Exchange step and want to make sure your children are secure with the skills needed to confidently tackle the step? Try this Year 4 Add Two 4-Digit Numbers One Exchange activity, which recaps the Year 3 step 'Add 2-Digit and 3-Digit Numbers' so that children are reminded of adding different numbers with an exchange. The resource is made up of three varied fluency questions and three problem-solving and reasoning questions that can be used individually or as part of the whole sheet. An answer sheet is also provided.