Class name _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 2007.10.18

Fill in the blanks. (18)

The counting unit of 1 and 0.48 is (), and it has () such counting units.

2.0.86 consists of () 0. 1 and () 0.0 1.

3,6.598 Pronunciation (), written in 10: 035 ()

4. Four tenths, six tenths and seven percent make up this number ().

5. The first digit to the left of the decimal point is (), its counting unit is (), the second digit to the right of the decimal point is (), and its counting unit is ().

6. fill in ">", "

6.009 6.01.32 0.320 30cm 3m

50.02 ○ 50.2010mm ○ 2.5cm 2.3 1.02. 13

7. Rewrite the following figures into numbers in units of "10,000" or "100 million".

9084000 = () billion 586 10000 = () billion

2468900000 = () billion 378 = () million

8. Keep two decimal places.

7.093≈( ) 0.397≈( )

1.998≈( ) 4.595≈( )

9. Three digits plus two decimal places is 5.86. The maximum value of these three decimal places is (), and the maximum value is ().

Second, choose. (8 points)

1, 5.7+8.9+8.3 = 5.7+8.3+8.9 Used ().

A additive commutative law b additive associative law c additive commutative law associative law.

2, 4 Angle 6 points +7 yuan 4 points = ()

A 7 yuan 8.6 points B 12 yuan C 7.50 yuan.

3. Rewrite 2 meters and 3 centimeters into meters. The decimal number is () meters.

A 2.3 B 2.03 C 2.003

4. Calculate the decimal subtraction, accidentally increase the subtraction by 3.2, and the minuend remains the same, then the difference () he calculated.

A increases by 3.2 B and decreases by 3.2 C.

5. The decimal number greater than 0.6 and less than 0.7 is ()

A1b10ccountless.

6. When two numbers are divided by 9, the minimum divisor is ().

A 9 B 10 C 1 1

The number that can be added in 7, 6.48-6.□ 5 and□ is ().

A 4 B 5 C 6

8. One addend is three decimal places, the other addend is two decimal places, and the sum is () decimal places.

A two, b three, c five

Third, calculation. (44 points)

1, oral calculation (6 points)

0.7+0.9= 0.8+0.6= 8.24+3.76= 4. 1-3.8=

14+0.78= 14.6-0.34= 1.3+8.56= 0.8-0.55=

0.78+2.2= 5-0.08= 3.25+0.75= 10-0. 1=

2, column vertical calculation and checking (8 points)

8.65-6.37= 12-7.65= 13.6+4.46= 0.99+ 1. 1=

3, simple calculation (18 points)

4.02+5.4+0.98 5. 17- 1.8-3.2 13.75-(6.48+3.75)

4.8+0.2-4.8+0.2 3.45+8.7+ 16.55+ 1.3 27.38-5.34+2.62-4.66

4, column calculation (12 points)

(1) What is the sum of 7.07 and 3.45 minus their difference?

② What is the result of adding 3.54 times 4.3 to the number less than 15.7?

③ The number A is 48.3, which is 12.7 more than the number B. What is the sum of the two numbers?

④ How much is 9.8 more than the sum of 2.34 and 4.36?

Fourth, solve practical problems. (30 points)

1. Xiaohong bought a pencil case, paid it to 20 yuan, the shop assistant, and got it back 14.5 yuan. How much is this pencil box?

This class took part in the high jump exam. Xiao Ming jumped 1.24 meters, and Xiao Wei was 0. 13 meters taller than Xiao Ming. Xiaohua jumps 0.02m shorter than Xiao Wei. How many meters did Xiaohua jump?

3. The grain depot purchased 23,400 tons of soybeans, and corn was 4,200 tons more than soybeans. How many tons of soybeans and corn did the grain depot buy?

Miss Li bought three books, the prices were 7.80 yuan, 5.65 yuan and 6.20 yuan respectively. He paid 20 yuan money, how much should he get back?

This food factory produced 5.8 tons of biscuits in January, and then produced 0.2 tons more than last month every month. How many tons of biscuits did this food factory produce in April?

6. When Xiao Mahu calculated 4.25 plus a decimal place, he got 6.28 because the mistake was only aligned with the end of the number. What's the correct number?