1. Expand 37.6 by 100 times, and then reduce it by 10 times to get the number ().

2. Write 7.79 139 13 ... as (), and keep one decimal place as ().

3.5 yuan 9 jiao = () yuan 0.6 = () points.

8kg 10g = () kg 5.2m = () m () cm

4. Fill the brackets with ">" and "<" or "=".

4.72×0.99 ( ) 4.72 1 17÷ 1.3 ( ) 1 17

The quotient of 5.9.8÷ 1.5 has three decimal places ().

6. If the number A is a non-zero natural number, the minimum factor of A is (), the factor of A is (), and the minimum multiple is ().

7. There is a four-digit number, which is a prime number in its position, the smallest natural number in its hundredth position, the smallest composite number in its tenth position, and the numbers in its position are both even and prime. This four-digit number is ().

8. In multiples of 2, 3 and 5, the smallest three digits are () and the third digit is ().

The multiple of 6 within 9 and 50 is (); The multiple of 8 is (); The common multiple of 6 and 8 is (), of which the smallest is ().

All factors of 10.24 have (), and all factors of 18 have (); The common factor of 24 and 18 is (), and the common factor of 24 and 18 is ().

1 1. A two-digit number is a multiple of 5, and the sum of the digits in each digit is 8. This two-digit number is () or ().

12. If the factor of a number is 15, then its minimum multiple is ().

2. Right or wrong, mark "√" for the right and "×" for the wrong. (6 points)

1. All prime numbers are odd except 2. ( )

2. The product of any two prime numbers must be even. ( )

3. Numbers with unit of 0 must be multiples of 2, 3 and 5. ( )

4.13,51,47,97 are all prime numbers. ( )

5. The product of two consecutive odd numbers must be a composite number. ( )

6 .. The multiple of a number is always greater than the factor of this number. ( )

Third, choose. (10)

1. Quotient is a cyclic decimal, and the formula is ().

a . 18÷96 b . 15÷0.8 c . 9.2÷ 1.6d . 24÷9

2, in the following formula, the smallest result is ().

A 0.65×3 B 0.65÷3 C 3÷0.65

3. The following formula is equal to the quotient of 3.6÷0.25 ().

a . 3.6÷25 b . 36÷0.25 c . 360÷25d . 36÷25

4. The minimum two digits are both 2 and multiples of 3 are ().

a、6 B、 12 C、24 D、96

5, according to the number of factors, non-zero natural number can be divided into ().

A, prime number and composite number b, odd number and even number c, prime number, composite number and 1 D, odd number, even number and 1

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

a、0 B、 1 C、2 D、3

7. The height of any triangle is ().

A, 1 B, 2 C, 3D, countless

8, 57□2 is a multiple of 3, and the number in □ may be ().

a、3 B、5 C、7

9. In each of the following groups, it is () that all three continuous natural numbers are composite numbers.

a、 13、 14、 15 B、7、8、9 C、 14、 15、 16

10. Odd if (), the result is even. ( )

A, add an even number b, multiply by 1 C, add an odd number d, and divide by 1.

4. Draw the symmetrical figure of the first figure according to the given symmetry axis. Please move the second number up by 4 squares and then move it to the right by 2 squares. (4 points)

5. calculation. (28 points)

1. Write directly. (per space 1 point, *** 10 point)

5. 1-2= 7.2÷ 1.2= 3.86× 10= 0.4×0.3=

3.9×0.0 1= 9.73÷ 10 98.4÷ 100= 1—0.55=

2.5×4= 0.5+0.43=

2. Longitudinal calculation: (2 points for each question, ***6 points)

4.85×0.73= 25.73÷8.3= 9—5.48=

3. Simplify the off-type calculation if it can be simplified: (3 points for each question, *** 12 points)

4.85× 1.25×8 6.8÷ [(4.5-2.8)×0.4]

39÷0. 125÷0.8 4.8×0.65+0.65×5.2

6. Can you answer the following questions? (24 points)

1. Mom wants to put 2.5 kilograms of sesame oil in bottles, and each bottle can hold at most 0.4 kilograms. How many bottles should I prepare? (5 points)

2. Lele Supermarket engaged in promotional activities, bought a box of milk (24 boxes) and 44 yuan, and also sent a box; The same milk,

Mimi supermarket's promotion method is 9.40 yuan for 5 boxes. Which is cheaper? (5 points)

Xiaohua's balcony needs to be re-tiled. There are two with similar decoration level. Which do you think is more cost-effective? (5 points)

1.6 m Company A: Company B in 58 yuan: 396 yuan per square meter after all paving.

4.5 meters

4. There is a basket of pears, whether distributed to 9 people or 12 people, which have just been eaten. How many pears are there at least in this basket? (4 points)

5. Party A goes to the library every 9 days, and Party B goes to the library every 6 days. Both of them went to the library on July 29th. Excuse me, how many days later, the two met again in the library? When was it? (5 points)