1. Fill in the blank: 20% 1. 2.5 hours = (2) hours (30) minutes 5060 square decimeters = (506) square meters. The divisor of 2. 24 is (1, 2, 3, 4, 6, 8, 12. 4. The numerator of the simplest fraction is the smallest prime number and the denominator is the composite number. The highest score is (1/2). If you add decimal units like (1), you will get 1. 5. Cut a cuboid whose length, width and height are 5 decimeters, 3 decimeters and 2 decimeters respectively into two small cuboids, and the maximum sum of the surface areas of these two small cuboids is (30) square decimeters. 6. With a 52 cm long wire, you can weld it into a rectangular frame. The frame is 6 cm long, 4 cm wide and 3 cm high. 7.A=2×3×5, B=3×5×5, the greatest common divisor of A and B is (5), and the smallest common multiple is (150). 8. When the side length of a cube is tripled, its surface area is increased by (54) times and its volume is increased by (27) times. 9. Compared with 5/ 1 1, the unit of (4/9) is larger, and the value of (5/1) is larger. 10. The greatest common divisor of two numbers is 8 and the least common multiple is 48, where one number is 16 and the other number is (8).