The answer to the math multiple and factor exercise in the fifth grade of primary school.

1. Fill in the blanks (each question 1 point, *** 19 point)

1. In natural numbers, the number of () is called even number, and the number of () is called odd number.

2. The number with () or () is a multiple of 5.

3. A number that is both a multiple of 2 and a multiple of 5 is characterized by ().

4.6 is a multiple of (), a multiple of (), and a multiple of ().

5. The sum of odd and even numbers is (); The sum of odd numbers and odd numbers is (); The sum of even numbers and even numbers is ().

Is 6.87 () or ()?

7. Two digits, both multiples of 5 and 3, are even numbers, and the minimum digit is ().

8. The smallest two-digit number divisible by 2, 3 and 5 is ().

9. Within the range of natural numbers, the smallest prime number is (), the smallest composite number is (), the smallest odd number is (), and the smallest even number is ().

Second, the judgment (put "√" for the right and "×" for the wrong) is wrong.

1. In natural numbers, all are even except odd numbers. ( )

2. Numbers with 3, 6 and 9 are multiples of 3. ( )

3. 1 is a prime number. ( )

4.2 is both an even number and a prime number. ( )

5. All prime numbers are odd numbers. ( )

6. 10 is a multiple and 5 is a factor. ( )

7. The largest factor of natural number A is A, and the smallest multiple is A .. ()

8. Natural numbers are either prime numbers or composite numbers. ( )

Three. Choice (2 points for each question, *** 14 points)

1. In the following figures, () is a multiple of 2 and 5.

A.24 B. 30 C. 45

2. The minimum multiple of () is 1.

A. 1

3. The sum of the minimum prime number and the minimum composite number is ()

A.6 B. 5 C. 3

4. In the figure below, () is a multiple of 2 and 3.

A.27 B. 36 C. 19

5. The sum of two prime numbers is 12, and the product is 35. These two prime numbers are ().

A.3 and 8 B. 2 and 9 C. 5 and 7

6. 1, 3 and 5 all belong to 15 ().

A. prime factor B. common factor C. factor

7. A composite number has at least () factors.

A. 1 B. 2 C. 3

Iv. Classification (2 1 min)

45 67 78 34 23 24 15 128 76 85 90

89 49 79 3 1 97 87 77 37 0 123 55

In the above picture, even numbers have () odd numbers have () prime numbers have () composite numbers have multiples of () 2 is a multiple of () 5 is a multiple of () 3 is a multiple of ().

5. Fill in a number in □ so that each number is a multiple of 3. (3 points for each question, *** 15 points)

□5, □ can be filled with (); 3□7 and□ can be filled in (); □78, □ can be filled in () 14□3, □ can be filled in (); 60□ 1, □ can be filled in ().

Six, application questions (5 points for each question, *** 15 points)

1.5. Some students from Class 1 took part in tree planting activities, and 37 people have come. Five people are divided into groups, and at least a few more people are needed to finish them.

2. Xiaohong bought the following books: a story book 10 yuan, a science book 8 yuan and a composition book 7 yuan. Give it to 50 yuan, the salesman, and bring 22 yuan back, right? Why?

There are 36 pieces of candy, which are distributed to the children. Can these two pieces be accurately divided? What about three dollars and three dollars? What about five dollars and five dollars?

Seven, high questions (5 points for each question, *** 10)

1, a number is a factor of 42 and a multiple of 3. What will this number be?

2. 1 17□ is both a multiple of 3 and a multiple of 5, and □ can be filled with (); 249□ is a multiple of 2 and 3, and □ can be filled with ().

If you still want it from me, I hope it can help you. I wish you great success and further progress! 1. Fill in the blanks (each question 1 point, *** 19 point)