1. Cut the 2m-long rope into 4 sections on average, with each section being () m long and each section being () long.

2. There are () true fractions with denominator of 7 and () false fractions with numerator of 7; The fractional unit is 16. The true score is (), the minimum false score is (), and the minimum band score is ().

3,5/7 means to divide () into () parts on average, and that's it. Its decimal unit is (), and there are () such decimal units. If you add a decimal unit like (), it is equal to 1.

Second, judge.

The decimal units of 1 and 5/7 are greater than those of 1/4. ( )

2. Divide three cakes to four people equally, and each person will get 14 of three cakes, or 34 of one cake. ( )

3. When the common factor of two numbers is 1, the least common multiple of two numbers is their product. ( )

If b7 has a wrong score, then B must be greater than 7. ( )

The denominator is the smallest prime number, so there is only one true fraction. ( )

Third, choose.

1, 6 years and 7 months = ()

67 10

2, a, b and c are natural numbers greater than 0, A-B-C, then AB ()CB.

A.b . c =

3. Two ropes, A and B, are the same length. Rope A is cut12m, rope B is cut12m. The rest of the rope ()

A.a is shorter than B, and B is shorter than A, both of which are the same length. D. not sure.

4. In 23, 0.6 and 45, the number is ().

A.23 B.0.6 C. 45

5, 7 days to build a 3 km highway, this road is under construction every day ().

A. VII

/

15

/

7 C. 1

/

15

Fourth, solve practical problems.

1 class and class 5 (1) have a total of 48 people. There are 39 students with more than 80 points in the mid-term exam. What percentage of students are under 80 in the class?

2. The area of a piece of colored paper is 45 square decimeters, and 20 square decimeters have been used. How much is this colored paper used? How much of this colored paper is useless?

3. A pile of coal used 24 tons, and there are 36 tons left. What percentage is used?

It takes 25 days to produce a batch of cement. What percentage of this batch of cement is produced on average every day? How much is this batch of cement produced in 13 days?

5. The school bought 5 boxes of chalk and 90 boxes of chalk, which were distributed to class 18 on average.

(1) How many boxes are assigned to each class?

(2) How many boxes are assigned to each class?

6. Xiaoming made 80 crossings, and four of them were wrong.

(1) What percentage of the total are wrong questions?

(2) What percentage of the questions are correct?

(3) What percentage of the wrong questions did you do?