Basic Rules:[br]The user makes an estimation on the number line.[br]He/she presses the ‘Check’ button to check his/her estimation.[br]If it is in the correct interval, +3 points are added, if it is completed before the time runs out, one fifth of the remaining time is added as points. If it is close, it gets +1 point and if it is completed before the end of the time, one fifth of the remaining time is added as points. If he/she estimated far away, he/she gets no points. [br]Feedback:[br]Correct: Correct estimation.[br]Almost you are very close: You are close.[br]Maybe next time: Wrong estimation, try again.[br]Use the ‘New Rational Number’ button to create a new rational number.[br]Functions of the buttons:[br]‘Check": Evaluates the estimate.[br]‘New Rational Number": Starts a new Rational Number.[br]Number Line Usage:[br]Estimations are made with a point that can be dragged on the number line.