1, calculate carefully and pay attention to the decimal point.

3.5×0.4= 7. 1×0.4= 2.5×0.4= 4.5÷0. 15=

2.3×0.2= 1-0.07= 12.4÷4= 2.5+ 1.5=

5.9×0.2= 0.25× 1.3×4= 20÷0.0 1= 9÷0.0 1=

2. In 4×5=20, () is a multiple of (), and () is a factor of ().

The factor of 3 and 36 is (), where the prime number is ().

4. A number, which is both a multiple of 12 and a factor of 12, is ().

5. Two consecutive natural numbers that are both prime numbers are () and (). The first network of new curriculum standards

6. In the numbers 15, 18, 29, 35, 39, 4 1, 47, 70 and 87:

(1) is an even number (); (2) There are odd numbers ();

(3) The factor of 3 is (); The multiple of ④5 is ().

7. The minimum natural number is (), the minimum prime number is (), and the minimum composite number is ().

8 has a factor of 3, which is also a multiple of 2 and 5. The smallest three digits are (). W W W W x K b 1 c o M

9. Three children in a carton can see at most () faces and at least () faces.

10, the sum of three consecutive even numbers is 96, and these three numbers are (), () and () respectively.

1 1, 226 At least the increase () is a multiple of 3, and at least the decrease () is a multiple of 5.

12, with a two-digit number of 5□, if it is a multiple of 5, fill in □ (). If it is a multiple of 3, □ can be filled with ().

Second, it is judged as 10%

1, natural numbers are divided into odd and even numbers according to whether they are multiples of 2. ( )

2. Natural numbers are divided into prime numbers and composite numbers according to the number of factors. ( )

3, 13, 5 1, 47,97 are all prime numbers. ( )

Even numbers must have more factors than odd numbers.