Let's use what we know about decimals to make and measure boxes. Learning targets: students can use the four operations on decimals to find surface areas and reason about real-world problems. Required Materials: copies of blackline master rulers origami paper. Choose at least three different sizes of origami paper for students to use. Common length and width sizes of square origami paper include 6 inch, 7 inch, 8 inch, 9 inch, and 9.75 inch.