If children are to become really confident with the basic skills of addition and subtraction it is important to spend a good amount time on practising them. In Year 4 children start to use written methods to add and subtract larger numbers in the thousands, but this depends on a sound understanding of mental methods, especially place value.Our latest set of pages really challenges this understanding as children are asked to carry out 4 separate calculations in turn, all based on the place value of the numbers. Get one wrong and all the following answers will also be wrong so care and attention to detail is needed.Go to Year 4 Subtraction