2, 20% of 40 kg is (); 25 of () is 18 tons; 34 meters less than 2 meters is () meters. 3、37 + 67 + 37 + 67 =( ) ×( ); 0.27×598 ≈( )

4. Discounts of 66%, 0, and 68% are arranged in descending order.

5，()÷ 2 = 9 () = () fold = ()% = = 0.75。

6. In the data set of 17, 33, 64, 8 1 50, 64, 13, the median is (), the mode is (), and the average of this data set is (). To make 17 a pattern, set ().

7. Saw a small stick equally, * * * saw it four times, and each section is the () () number of this small stick.

8. It takes 12 minutes for Xiao Ming to finish his math homework in one day, and () minutes for him to finish his math homework. You can finish half of today's math homework in () minutes.

9. The side length of a cube is decimeter, the volume of this cube is (), and the surface area is (); If you cut it into two cuboids of equal size, the cuboids have a volume of () and a surface area of ().

10, three consecutive natural numbers, the first number is 78 of the third number, and the second natural number is ().