1 Like 1, 2 and 4 are the common factors of 16 and 12, which are called their (). Among them, 4 is the greatest common factor, called their ().
The factor of 2,5 is (), the factor of 7 is (), and the greatest common factor of 5 and 7 is ().
3. When two numbers only have the common factor of 1, their greatest common factor is ().
The common factor of 4,8, 16 is (), and the greatest common factor is ().
The greatest common factor of 5, 5 and 7 is ().
6. Write the greatest common factor of the numerator and denominator of the following fractions.
8 12 ( ) 152 1 ( ) 9 15 ( ) 6 18 ( )
7. Find the greatest common factor of each group of numbers below.
14 and 7() 30 and 18() 13 and 5 ()
5 and 1 1() 8 and 9() 5 and 8 ()
4 and 16() 9 and 6() 8 and 10 ()
20 and 25() 28 and 7() 7 and 49 ()
8. Two numbers are coprime and have no common factor. ( )
9. When two numbers have a multiple relationship, the smaller number is their greatest common factor. ( )
10, the product of all common prime factors of two numbers is the greatest common factor of these two numbers. ( )
1 1, two composite numbers must not be coprime. ( )
12, fill in the appropriate numbers in the circle.
/kloc-factor of 0/5/kloc-factor of 0/8
Common factor of 15 and 18.
13. Write two numbers as required to make their greatest common factor 1.
(1) Both numbers are prime numbers: () and ().
(2) Both numbers are composite numbers: () and ().
(3) One is a prime number and the other is a composite number: () and ().
The greatest common factor of14,8,30 is ()
a、2 B、3 C、6 D、 10
The greatest common factor of15,54,36 is ()
a、3 B、2 C、9 D、 18
16, a is a multiple of b, and the greatest common factor of a and b is the product of () a, 1 B, a C, b D, a and b.
17, A and B are prime numbers, and the greatest common factor of A and B is ().
1 B, a C, b D, product of a and b
18. Tie flowers with 96 carnations and 72 chrysanthemums respectively. What is the maximum number of branches for each bunch of flowers to make the number of branches the same? How many carnations and chrysanthemums are there at this time?
19. A wall is 55cm long and 20cm wide. It's just covered with square bricks. What is the longest side of this tile?
20. Make a bouquet with 24 red flowers, 36 yellow flowers and 54 purple flowers, so that there are as many red flowers, yellow flowers and purple flowers in each bouquet. How many bunches can these flowers make at most?
2 1. There is a rectangular cardboard with a length of 80cm and a width of 60cm. If you want to cut it into a square of the same size and there is no excess, what is the maximum side length of the cut small square?
22. The store brought two brands of drinks (same specifications), one brand with 36 bottles and the other brand with 24 bottles. If they are packed in the same box and there is nothing left. How many different packages can there be? What kind of packaging do you think is suitable?