The utility model relates to a square cardboard box without a cover, with an edge length of 9 decimeters. How many square meters of cardboard are needed at least to make 50 such cardboard boxes

The utility model relates to a square cardboard box without a cover, with an edge length of 9 decimeters. How many square meters of cardboard are needed at least to make 50 such cardboard boxes

Cardboard = 9 × 9 × 5 × 50 = 20250 square decimeter = 202.5 square meter

Guangming paper box factory makes cube paper boxes with an edge length of 0.7 meters. How many square meters of cardboard do you need to make a paper box? What is the volume of the carton? (the thickness of cardboard is not included)

(1) 7 × 0.7 × 6, = 0.49 × 6, = 2.94 (square meter); (2) 0.7 × 0.7 × 0.7, = 0.49 × 0.7, = 0.343 (cubic meter); answer: to make this carton, at least 2.94 square meters of cardboard should be used, and the volume of carton is 0.343 cubic meter