Plenty of opportunity with these two free maths worksheets to consolidate understanding of subtraction and the use of positive and negative numbers. By year 6 children should find these pretty straightforward although some children do struggle with the concept of a negative number and will always take the smaller number from the larger number even when the question asks for the opposite (eg 1234 – 4321).
Free Y6 maths worksheets: Revise understanding subtraction (pg 1)
Free Y6 maths worksheets: Revise understanding subtraction (pg 2)