Magic Square Can you complete the missing entry in this Integer Magic Square? (harcourtschool.com)
Number Line Bounce This is an interactive addition and subtraction activity on the Number Line: reach the target number using four bounces. (Utah State Univ, NLVM)
Teaching Resources:
Number Line An interactive number line for illustrating addition and subtraction. Options: scale, end points, show/hide start/end of sum/subtraction, show/hide gap flash (The National Numeracy Strategy)