I. Fill in the blanks (2 points for each question, 30 points for * * *)

1, Xiaojun is sitting in the fourth row of the third column in the classroom, indicated by (3,4), Xiaohong is sitting in the sixth row of 1, indicated by (,), and the students indicated by (5,2) are sitting in the () row of ().

The reciprocal of 2/5 is (), 1/8 and () are reciprocal. 5 ×( )=0.2×( )= 1

3. The side length of a square is1/5m, the circumference is () m and the area is () m2.

4. The total length of a section of highway 1.600 meters has been repaired by 5/8, and () meters has been repaired, leaving () (not repaired). Class 5.6 (1) has 25 boys and 20 girls. The ratio of girls to boys is (), and the ratio of boys to the whole class is ().

6. A box of apples weighs 15 Jin, and two-thirds of them have been eaten, leaving () Jin.

Second, choose carefully. (4 points for each question, ***20 points)

1. In the music class, Cong Cong sits in the second row of the fourth column of the music classroom, represented by several pairs (4,2). Obviously, he is sitting in the first position directly behind Cong Cong, and this obvious position is represented by several pairs ().

a 、( 5，2) B 、( 4，3) C 、( 3，2) D 、( 4， 1)

2. The reciprocal of a number is the smallest prime number, which is () ①, ②, 13 1/23, a rope, 1/4 is cut off, which is exactly1/5m. How long is this rope? The correct formula is (). a . 1/4÷ 1/5 b . 1/4+ 1/5 c . 1/5÷ 1/4d . 1/4× 1/5

4. In a book, Xiaoying read 15 pages, which is 3/4 of Siu Wah Yuk's reading. How many pages did Xiaohua read? The formula is () a.15× 3/4b.15 ÷ 3/4c.15+15 ÷ 3/4.

5, in 400 grams of salt water, put 80 grams of salt, the ratio of salt and salt water is ().

1:4 b . 1:6 c . 1:5

Third, calculation. (* * * 20 points) 1, direct writing number (65438+ 0 points for each question, ***5 points) 5.

9× 1/5 = 8/2 1× 7/ 16 = 5/6 ÷ 1/3 = 1/2 ÷ 1/4 = 4/65438.

14÷(3/4 ×2 1/5 ) ( 7/9 +5/27 )×54 5/6 ×7/8 +5/6 × 1/8

3. Find the ratio. (2 points for each question, ***6 points)

1/20 : 1/4 3:0.6 5:5/ 12

Fourth, solve the problem. (6 points for each question, ***30 points)

1.( 1) If (3,2) is used to indicate the position of trampoline, can several pairs be used to indicate the positions of other amusement facilities? Please write it down. Please mark the position of the swing in the picture. The swing is 400 meters east of the gate and 300 meters north.

2. At present, human beings have carried out 123 lunar exploration activities, of which 20/4 1 was successful. How many successful lunar exploration activities are there?

3. The site needs to transport 360 tons of sand, and 518 has been delivered. How many tons to transport?

Xiaoqing weighs 28kg, which is just 7/ 16 of her father's weight. What's dad's weight? (Equation solving)

5. The length of a highway is 120km, in which the ratio of uphill road, downhill road and flat road is 2:3:5. How many kilometers are uphill road, downhill road and Heping road respectively?