Examples of pages 34, 36, 38 and 40 of the fifth grade mathematics in Hebei Education Press.
Topic 4: Squadron members stick paper on the four sides of a 46cm square carton, and regard it as 42.5 * 80 * 2 = 6,800 square centimeters (47,200+6,800) *1000 = 5,400,000 square centimeters and 5,400,000 square meters.