1, the maximum two decimal places less than 1 is (), which is different from 1 ().

The sum of 2, 5.5 and 0.25 is (), and the difference is ().

3,2.15 needs to add () equal to 3.

4. 1.2 is greater than the original number after the decimal point is removed ().

5. The sum of eight 0. 1 and eight 0.0 1 is ().

6. When calculating 0.8+4.87+0.2+4. 13, we can use the addition law () and the addition law ().

Make the calculation simple.

7. When calculating decimal addition and subtraction, align () and align () first.

8. The progress rate between 1 of the integer part and one tenth of the decimal part is ().

9.6.50 The decimal place () after zero at the end is removed, and the counting unit is changed from the original ().

It becomes ().

The counting unit of 10 and 4.25 is (), and it has () such units.

Second, the judgment question. (Correct drawing "√" and incorrect drawing "×") (6 points)

1、 10-(3.5+2.5)=6。 ……………………………………………………( )

There is a 0 at the end of the decimal part of the number. Generally, 0 should be deleted. …………………………( )

3. The commutative law and associative law of integer addition are not necessarily applicable to fractional addition. ………… ( )

4, 0.9 and 0.90 have the same size and the same counting unit. ………………………… ( )

5、7.58+6.5+4.42=6.5+(7.58+4.42)……………………………… ( )

6.32 decimal places written as one percent is 0.32. ………………………………………( )

Third, multiple choice questions. Fill in the brackets with the correct answers. ) (6 points)

1, a decimal, and the highest bit of the decimal part is ().

① Unit ② Ten, ③ Ten, ④ Percentile

Decimal () between 2.0.3 and 0.6.

(1) only one; ② There are two; ③ There are three; (4) countless.

3. Add zero or delete zero in the decimal (), and the size of the decimal remains the same.

① Before decimal point ② After decimal point ③ After decimal point ④.

0.6 contains () 0.0 1.

① Six, ②60, ③600, ④6000.

5. There are 23 () in it.

①0. 1 ②0.0 1 ③0.00 1 ④ 10

6, 3 kg 80 kg = () kg.

①380 ②3.8 ③3.08 ④3080

Fourth, calculation.

1, oral calculation. (6 points)

0.68+0.08= 5.2+0.88= 1-0.93=

3.6+5.8= 2.28-0.28= 10.9-9.7=

10-0.99= 3.8+0. 12= 0.09+0. 1=

4.9+6. 1= 4.7-0.47= 8.7-7.8=

2. Use vertical calculation. (22 points)

25.7+ 157.2= 30 1.6-2 1.9= 30-0.85=

13.78+2.45= 13.4-9.48=

check computations

19. 1+ 120.95= 100-29.2=

check computations

3. Use a simple method to calculate. (12)

6.2+5. 12+3.8 15.35+9.2-5.35 13.7-8.9— 1. 1

3.63- 1.25+ 17.37-8.75 78×45+22×45 56× 10 1

4. Calculate the following questions with decimals. (6 points)

63 yuan 7.2+32 yuan 0.8+5 tons 70 kg+12 tons 8 kg.

5. Column calculation. (6 points)

(1) A number is smaller than the sum of 2.0 1 and 2.29 1.05. What's this number?

(2) What is the difference between12.18 and 3.82 of 102.58?

Fifth, solve the problem. (20 points)

(1) The fourth grade donated 658.3 yuan to the disaster area, and the fifth grade donated more than the fourth grade 102.7 yuan. Two grades * * *

How much is the donation? (5 points)

(2) A truck transported 19.5 tons of chemical fertilizer in the morning, and 3.8 tons more in the afternoon than in the morning, and it was transported all day.

How many tons of fertilizer? (5 points)

(3) Miss Li spent 86.8 yuan on books and 5 kilograms on apples 15.8 yuan. She brought 100 yuan.

Really? (5 points)

4) Two engineering teams jointly build a section of highway. Team A repairs 2.82km every day, while Team B repairs 3.18km every day.

10 days later, there are 3 kilometers left between the two teams. How many kilometers is this road? (5 points)