Category name

fill (up) a vacancy

1, in 36÷3= 12, () and () are factors of (). In 3×9=27, () is a multiple of () and ().

All factors of 2 and 24 are ();

Write five multiples () of 15 from small to large.

3 and 7 are () numbers of 7 and () numbers of 7.

4. In 15, 18, 25, 30 and 19, the multiple of 2 is (), the multiple of 5 is (), and the multiple of 3 is ().

5. The biggest factor of a number is 12, and this number is (); The minimum multiple of a number is 18, and this number is ().

6. The minimum prime number is (), the minimum composite number is (), and () is neither a prime number nor a composite number.

Among natural numbers within 7.20, odd numbers and composite numbers are ().

8. A number is a multiple of both 36 and 6. This number may be ().

2. Judgment (tick "√" for the right and "×" for the wrong).

1 and 1 are odd numbers and prime numbers. …………………………………………( )

Except 2, all even numbers are composite numbers. ………………………………( )

3. 18 has six factors, and 18 has countless multiples. …………………( )

4. A number is a multiple of 6, and this number must be a multiple of 2 and 3. ………( )

5. The sum of two odd numbers is an even number, and the product of two odd numbers is a composite number. ……………( )

6. Prime numbers must be odd numbers, but odd numbers are not necessarily prime numbers. ……………………( )

7. The sum of three consecutive natural numbers must be a multiple of 3. ……………………( )

8. Because a×b=c(3 numbers are different), then C must be a composite number. ……… ( )

Third, choose (put the serial number of the correct answer in brackets)

The multiple of 1 and 13 is ()

① Composite number ② Prime number ③ may be a composite number or a prime number.

2, 1 1 and 2 are both ().

① Composite number ② Prime number ③ Odd number ④ Even number

3 and 2 are (), not ().

① Composite number ② Prime number ③ Even number

4, multiples of 4 are multiples of ().

① 2 ② 3 ③8

5.A number is a multiple of B number and C number is a factor of B number, so A number is a multiple of C number () ① Factor ③ cannot be determined.

6. If □37 is a multiple of 3, then □ may be ().

① 2、5 ② 5、8 ③ 2、5、8

4. Choose two digital cards as required.

1, the number is even:

2. The factor of the number of components is 5:

3, the number of components is not only a multiple of 3:

4. The number of components is a multiple of 2 and a multiple of 5:

5. The number of components is a multiple of 2 and a multiple of 3:

6, the composition number is not only a multiple of 3, but also a multiple of 5:

Verb (abbreviation of verb) fill in the number in □ as needed.

1, 3□6 is a multiple of 3, and the maximum in □ is ().

2. 17□ is a multiple of 2, and the maximum value in □ is ().

3,45 □ is a multiple of 3 and 5, and the maximum value in □ is ().

6. Fill in the appropriate prime numbers in the brackets.

9=( )+( ) 15=( )+( )

2 1=( )+( ) 39=( )+( )

40=( )+( )=( )+( )

Seven, solve the problem

There are 96 tons of coal in the freight yard, and there are three kinds of trucks with different loads. Which truck can be used to complete the loading? How many times have you installed it?

1 car 2 car 3 car

2 tons, 3 tons and 5 tons