2. If, then _ _ _ _ can be divisible by _ _ _ _.

3. The common factor of14 and 2 1 is that their common factor is.

4.36, 20, 45 and 90, some of them can be rounded by 3.

The number of frames is; The number divisible by both 2 and 5 is.

5. The factorization factor of120 is.

6. Given the number A = 3×2×5×5 and the number B =2×5×2×7, then the common factor of the numbers A and B.

The number is, and the least common multiple is.

7. Monthly examination paper of sixth grade mathematics: A number is not only a factor of 18, but also a multiple of 18. This number is.

8. If A and B are coprime, then the least common multiple of A and B is.

9. Use scores to represent the shaded parts in the chart.

10. Expressed in fractions; Represented by division;

1 1. Write the scores represented by a, b and c on the number axis respectively. Point a indicates;

Point b indicates; Point c indicates.

12.45 minutes = _ _ _ _ hours (expressed by the simplest fraction)

13. Connect with ""or "=".

( 1) (2)

14. Write two simplest scores greater than and less than.

15. It takes one week for an engineering team to complete a project, but it is completed every day.

16. The circumference of a rectangle is 16 decimeter, and its length and width are prime numbers, so its area is.

/kloc-The minute hand on the 0/7 clock face walked for 30 minutes, and the angle passed by the hour hand accounted for the angle passed by the minute hand.

Second, multiple-choice questions (2 points for each small question, *** 12 points)

18. Among the following groups, () is incompatible.

A. 13 and 15 B. 1 and 20 C.27 and 28 D.2 1 and 49.

19. Fold the rope in half for 4 times, and then each section is full length ().

A.B. C. D。

20. It takes 7 days to finish the task of weaving 30,000 square meters of carpet, and the average area woven every day is ().

10,000m2

2 1. Among the scores of,, and, the one that is not the simplest is ().

1。

22. The score less than or greater than or greater than is ().

A.0b.1c.2d. There are countless.

23. A series of scores are arranged according to certain rules as follows:, 1,, 2, 3. .......................................................................................................................................

50-25 A.D.

Third, use short division to find the common factor and minimum common multiple of each group in the following example (3 points for each question, 9 points for * * *).

24) 48 and 72 25) 9, 12 and 18 26) 10, 12 and 15.

Solution: solution: solution:

Four. Application questions (5 points for each question, *** 15 points)

3 1) The electronic clock rings every hour and lights up every 9 minutes. At noon 12, ring and light. When is the next bell and light?

Solution:

Verb (abbreviation of verb) Additional questions: (65438+ 00 points for each question, ***20 points)

1. On a 100 cm wooden stick, dye a red dot every 5 cm from right to left, and dye a red dot every 6 cm from left to right at the same time, and then saw the wooden stick section by section along the red dot. How many short sticks with the length of 1 cm are there?

2. Connect the midpoints of the sides of the square to get a small square. This connection results in the fourth small square. What percentage of the blank area does this small square occupy?