Square roots on a number line - 1st part

Root, Square
Down applet shows how to mark square roots of the natural numbers on the number line. Click the animation button in the left-down angle of the applet to start animation. Also, you can stop the animation by clicking the same button. Instead of using animation button, you can click the 'steps' slider and push plus + on the keyboard more times. If necessary, you can use minus - on the keyboard as well. Can you make this construction on the paper?