Answers to the mathematics test questions of "Learning and Practice in Winter Vacation" published by Zhejiang Science and Technology Publishing House in grade five;

Mathematics: In 1-20, the number that is both odd and sum is (9 15), and the number that is both even and prime is (2).

The product of two prime numbers is 65, which are (5) and (13) respectively.

Write that the false fraction with denominator of 5 equal to 1 is (5/5).

The greatest common factor of two prime numbers is (1).

The greatest common factor of 4 and 16 is (4).

In a place

-When a=( 1), it is the decimal unit of this score; When a=(7), the maximum.

eight

True score; When a=(8), it can be converted into integer1; When a=(8), it is the minimum error score.

The sum of two prime numbers is 16, and the product of these two prime numbers is (63).

The common factor of the following numbers that are not 12 and 18 is (9).

A. 1

Natural numbers (except 0) consist of two groups of numbers (even number and product number).

Judgment: Natural numbers (except 0) are either prime numbers or composite numbers. (no)

A number with a factor of 2 must be a composite number. (Yes)

The sum of two prime numbers must be even. (Yes)

The true score is less than 1 and the false score is greater than 1. (no)

Greater than 3 and less than 5

There is only one score. ()

7 7

One thing: in 5 1, 73, 16, 29, 42, 89, 38, 1, 24, 57, the prime numbers are: (5 1, 73, 29, 38, …) respectively.

The composite number is: (73, 1642, 89, 24, 57)