Nelson EducationSchoolMathematics 2  
Surf for More MathLesson 7  Finding the DifferenceUse this interactive activity to encourage students to have fun on the Web while learning about finding the difference. Students can try this activity on their own or in pairs.
GoalExplore subtraction as comparing.
Instructions for UseNumber Line Arithmetic lets students visualize subtracting numbers on a number line. To use Number Line Arithmetic, select the "" button at the bottom of the screen. Click the "Go" button under the mathematical problem. Animated arcs represent the problem. Click the "New Problem" button and a new problem will be displayed.

