Number line (mental addition/subtraction)
Instructions
1. Select whether you will be demonstrating addition of integer or decimal values by clicking on the appropriate checkbox.
2. Click on the 'Question' box if you wish to use the provided question.
3. Input the required values into the input boxes provided.
4. Move the orange and green arrows to appropriate positions along the number line so that sensible steps are made to complete the addition. E.g. 32 + ? = 67 could be 32 + 8 + 20 + 7 = 67, or 32 + 30 + 5 = 67. The green arrow can be placed on top of the purple arrow if only two steps are being taken.
5. Clicking on the 'show sum' box clarifies the addition being performed.