I. Fill in the blanks: (18)

1) When dividing two numbers, if the divisor is enlarged by 100 times, the dividend should be () to keep the quotient unchanged.

2) When calculating 2.025÷ 1.47, first move the decimal point of 1.47 to () to make it (), then move the decimal point of divisor 2.205 to (), and finally calculate according to division with divisor as integer.

3) Divide two numbers that are not 0, and when the divisor () is divided, the quotient is greater than the dividend; When the divisor (), the quotient is less than the dividend.

4)8.24÷0.063 Keep one decimal place, and calculate the quotient to () decimal place.

5) In practical application, the quotient of fractional division can also be obtained by the method of (), with a certain number of decimal places reserved.

6)3.25÷0.7 Keep a decimal place about equal to (); Keeping a decimal place is about equal to ();

7)6. 19 19 ... Keep two decimal places ().

8) The three-digit decimal with two decimal places is 1.50. These three decimal places are (), and the minimum value is ().

9) If the decimal point of a decimal is shifted one place to the left, the number obtained is 2.52 less than the original number. This decimal point is ().

10)3.47÷0.62. When the quotient is 5.5, the remainder is ().

Second, true or false: (5)

1.X=0 is not an equation. ( )

2. Formulas containing unknowns are called equations. ( )

Xiao Ming is sitting in the fifth row of the second row, which is indicated by two numbers (2,5). ()

There are 10 red balls, 6 yellow balls and 6 black balls in the box, which are the same size. Feel free to touch 1, and the possibility of touching the red ball is the least. ( )

There are X apple trees in the orchard, the number of pear trees is 30 times less than that of apple trees, and the number of pear trees is aX-30. ( )

Third, multiple choice questions. (5)

1, if the product of the multiplication of two numbers is less than the multiplicand, then the multiplier ().

(1) greater than 1 (2) less than 1 (3) equal to

2, 30 points = () (1)0.3 (2)3 (3)0.5

3. Through simple calculation, 24.6× 4.6+246× 0.44+24.6 should be ().

( 1)24.6×(4.6+0.44+ 1) (2)24.6×(4.6+4.4+ 1) (3)24.6×(4.6+4.4)

4. The number obtained by multiplying a decimal by 3 is 7.2 larger than the original number, and the original decimal is ().

( 1)2 1.6 (2)3.6 (3)2.4

5. A three-digit decimal is 5.50 after rounding, which may be ().

( 1)5.504 (2)5.499 (3)5.509 (4)5.495

Four. Calculation (18)

1, a number written directly. (8)

4.5×0.07= 6.3÷0.09= 2.5×3.6= 19.8÷3.3=

5÷0.25= 0.76÷0.4= 29.29÷29 1 1 1÷0.37

2. Use vertical calculation (9)

5.08×0.65 (the number retains one decimal place 246.4÷ 13 (the number retains two decimal places).

10÷3.3 (decimal representation of business cycle)

3. Reasonable and flexible calculation. ( 18)

16.6÷5.5× 1.7 32.8× 10.5÷0.6 3.6×2.5+7.5×3.6

3.8× 10. 1 0. 125×32×2.5 (64.87×2.34+48.7×0.266

4. Find the unknown X. (4)

( 1)x÷0.35 = 0.25(2)x×0.5 1 = 10.455

5. Column calculation. (9)

What is the quotient of (1)3.06 divided by the product of 0.25 and 68?

(2) What is the quotient of the product of 2.5 and 0.4 multiplied by 2.5 divided by 0.4?

(3) Divide 0. 178 by 17.8 and multiply the quotient by 6.4. What is the product?

Fifth, solve the problem. (24)

1. A factory used 125 tons of coal in May, 2.5 times that in April. How many tons of coal were used in April and May?

2. Each oil drum can hold up to 4.5 kilograms of oil, and buy 62 kilograms. How much oil drum should be prepared at least?

3. 15 horses have been fed with feed for 9 days 175.5 kg. How many kilograms of feed do 25 horses need in January?

4. The width of the school dance studio is 6.4m, and the length is 1.5 times as wide. How many square meters is the area of the dance studio?

5. Zhou Pu Township will dig a canal with a length of 22.2 kilometers. It has been dug for 6.5 days, with an average of1.2km per day. The rest is required to be dug in 8 days. How many kilometers do you dig every day on average?

6. The cucumber delivered from the supermarket is 60.5 kg more than the eggplant, and the cucumber is less than the eggplant when it is sold at half price 10.5 kg. How many kilograms of cucumber and eggplant are shipped?