1. Click on the "Question" box if you wish to use a provided question.[br]2. Type in the required "Percentage decrease" in the appropriate box.[br]3. Type in the "New value" box the appropriate amount.[br]4. Click on the "Question" box if you wish to use a provided question.[br]5. Move the slider to the right to 'shift' this amount to the other end of the bar, pausing at the original amount.[br]6. Check the solution if you used the provided question by clicking on "Solution" box.[br]7. Click on the "Reset" button to start again and get a new question.