How to make a simple origami stairs

(page 3)

3rd picture of simple origami stairs

03.

{valley-fold} in half vertically and then {unfold}.

Prepare to apply a horizontal "gate-fold" and then "unfold" .

4th picture of simple origami stairs

04.

Apply the horizontal "gate-fold" of the step #3 and then "unfold" .

Prepare to apply a vertical "gate-fold" and then "unfold" .