This is a very common fold in origami where the paper is folded inside itself.

Inside Reverse Fold Step 1

1) I’m starting out with a square folded in half diagonally

 

Inside Reverse Fold Step 2

2) I’m going to make an inside reverse fold on the right side so I start by making a valley fold.

 

Inside Reverse Fold Step 3

3) Crease the fold well and then unfold it.

 

Inside Reverse Fold Step 4

4) Flip the paper over and fold the same crease from step 3 in the opposite direction along the same line you already folded.

 

Inside Reverse Fold Step 5

5) Open the paper up somewhat and fold the section you just creased inside. Since you folded that section both ways it should easily tuck inside.

 

Inside Reverse Fold Step 6

6) Push everything flat and you have an Inside Reverse Fold.

 

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