MAKING A BOX
This is the finished square measuring 15 cm wide X 20 cm long
Remember that we made a cut 5 cm from each extreme (end) to the other? Well, now we fold both sides using that cut we made.
Then, we will cut the two short sides which we haven't folded. Using scissors, cut 5 cm deep (as shown in the image above).
This will help us fold the other two side to make our box (see image below).