Generate a number line and use the two markers with numbered boxes which can be moved along the number line. You can show the sum and difference between the two numbers and the calculation represented. You can hide and reveal the numbers in the boxes.
Clicking on the hidden buttons below the number line creates an interval displayed as a hidden number line. The ITP can be used to refine children’s understanding of the decimal number system and to practise and develop their estimation skills. A marker can be placed at different points on a number line.