first part

I believe you can fill it out correctly and quickly (each question 1 point, * * *1point).

1, what is 3 2.5? The formula of addition calculation is (), and the formula of multiplication calculation is (

)。

2.26× 0.27 indicates what () of () is.

3, 2.768 1 accurate to one thousandth (), keep the integer as ().

4.6.4 The meaning of dividing by 2 is (), and the calculation result is ().

5, 3 ÷ 6 = 0.5. If both the dividend and divisor are enlarged by 10 times, the quotient is (). If the decimal point of the dividend is shifted two places to the left, the quotient is ().

6, 7.2888 ... The number of digits in the decimal part is (), which means () decimal.

7. Write the product of 2.4×0. 17 with () decimal places, and do not calculate it; The highest ranking of 3.268÷0.38 quotient is ().

8. Using Law () and Law () to calculate 8×0.25×0.4× 12.5 can make the calculation simple.

9. Four times the number A equals five times the number B, the known number B is 0.08, the number A is (), and the formula for finding the number A is ().

10. The approximate value of three digits with two decimal places is 3. 15. The minimum decimal number is () and the maximum decimal number is ().

I believe you can make the right choice. [5 points]

1, the product of two numbers is 2.6, where one factor is enlarged by 10 and the other factor is reduced by 100, and the product is ().

A0.026 B0.26 C2.6 D26

The quotient of 2.0.54÷0.5 is 1 and the remainder is ().

A0.04 B0.4 C0.004 D4

3.7.546 When () is reserved, the value is less than the original number.

An integer b, a decimal c and two decimal d are uncertain.

4. The following number is both a pure cyclic decimal and a pure decimal. The number is ().

........

A 2.03 B 4.253 C 0.06 D0.058

5, 0.234823482348 ..., the 99th digit after the decimal point of this pure cyclic decimal is ().

A2 B3 C4 D8

Third, keep your eyes open and distinguish right from wrong. [5 points]

1 is multiplied by two numbers, and the product must be greater than these two numbers. ( )

2. In the result of decimal multiplication, all zeros after the decimal point should be removed. ( )

3.0.70 is the same size as 0.7, so is the counting unit. ( )

4. Only one number is greater than 4.6 and less than 4.8. ( )

5. When a piece of wood is sawed into 4 sections, it is necessary to 2.8 yuan; If it's sawed into eight pieces, it's 5.6 yuan. ( )

the second part

Calculate carefully and don't make mistakes.

1, a number written directly. [10 point]

3×0.4= 1.25×5×8= 8.8÷0.8= 1.5÷30= 4.2÷0.0 1=

8×(2.5+0.25)= 8.4×0.2+ 1.6×0.2= 1.23÷3= 2.4×2.5=

5.4-2.5- 1.4=

2, column vertical calculation (two decimal places) [6 points]

95×0.83 3.509÷0.27 32÷42

3. Off-mold calculation. (What can be simplified should be simplified) [12 points]

12.5×8.8 0.3×[(38.6- 12.75)÷2.5] 25.73×6.5+25.73×3.5

3.7×6.8÷ 3.7×6.8

4. Find the unknown X [8 points]

X× 1.9 = 1 1.97 0.357÷X = 7× 1.5 = 7.5 0.28×X = 1.008

5, column calculation [16 points]

① What is the quotient of the product of 3.8 and 1.6 divided by 7.6?

② What is the product of 21minus 3.5 multiplied by 0.5?

③ How much is the quotient of 5.58 divided by 0.9 more than the product of 10.2 multiplied by 0.5?

④9.5 Subtract the product of 3.4 and 2.8, and multiply the difference by 7.5. What is the product?

the third part

Use knowledge to solve problems.

1. Xiaohong's family used 14.5 tons of water last month, and the price per ton of water was 2.30 yuan. There are five people in her family, so how much water does each person pay? (5 points)

2. The height of Wang Ming is1.36m, and Xiao Qiang is 0.04m taller than him. The sum of their heights is twice that of Xiaoling. How tall is Xiaoling? (5 points)

3. Xiao fen's home is in the east of the school, Xiao gang's home is in the west of the school, and both of them go home from school at the same time. Xiao fen walks 80 meters per minute, and Xiao gang walks 70 meters per minute. Four minutes later, two people returned home at the same time. How many meters are they apart?

4. I used to make a machine with 1.43 tons of steel in agricultural machinery factory. After technical transformation, each machine saves 0. 1.3 tons of steel. The steel used to make 300 machines, how many can be made now? (6 points)

Lily and her father go to the amusement park to play roller coaster games. When buying a ticket, her father paid 20 yuan and got back 2 yuan. The ticket price of roller coaster students is half that of adults. What are the student and adult fares? (7 points)

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