This worksheet provides learners with different strategies for calculating across zero. All questions here involve subtracting a positive number from a positive number and will aid in pupils understanding the symmetry of zero and prepare them for further calculations with positive and negative numbers.

Number lines are used throughout section A to complete subtraction statements. Three different types of number lines are used and are designed to encourage pupils to think about how to partition numbers when calculating with them. In section B, pupils will use partitioning to complete subtraction statements.

Students then predict whether subtraction calculations will cross zero or not in section C.