1, write directly. (7 points)

1.2+0.8= 4- 1.5= 5.6-0.8= 15×4=

2.7-0.7= 2.3- 1.8= 9+3.3= 18×3=

0.9+0.3= 7+2.7= 10-6.2= 12×7=

120×30= 600×50=

2. estimate. (8 points)

480×4≈ 205×38≈ 5 16×56≈ 89×403≈

8×3 1 1≈ 1 18×47≈ 50×302≈ 387×72≈

3. Use vertical calculation. (12)

256×34= 25×342= 409×58=

480×57= 72× 190= 3500×24=

4. Off-mold calculation. (10)

2000-45×24+996 1 160+(76+60)×30 680÷2×( 1289-756)

(85+79)×( 133-73) 732-( 174×25-3960)

Second, fill in the blanks. (17)

1,100000 is (),100000 is (), one million is () 100000, and one hundred million is () 10 million.

The number "5" of 2.630590000 is in the position of (), which means (). The highest position is (), which means (). The number rewritten as "ten thousand" is (), and the precision to "hundred million" bits is ().

3. The number consisting of four tens of millions, five hundred thousand, three thousand and six is (), which is pronounced as ().

4, 950,703 writing (), accurate to ten thousand ().

5. The sum of the smallest six digits and the largest six digits is ().

6. There are () days in a normal year and () days in a leap year. There are () days in the first quarter of this year.

7, 2 years = () March 3rd = () 5 o'clock = () 36 months = () years.

The day before March 2004 1 was () month ().

9. Use the 24-hour timing method to indicate the following time:

8 am () noon 12 pm () 4 pm () afternoon 10 pm ()

10, Naughty attended a friend's birthday party, which started at 6: 30 pm and ended at 2 1: 20. The birthday party lasted () hours () minutes.

1 1 contains () 0. 1, and 0.08 contains () 0.0 1.

Three, omit the mantissa after "ten thousand" or "one hundred million", and find the divisor. (8 points)

2044703 843286080 9957485000 4830000000

Omit the mantissa after ten thousand digits.

The mantissa after omitting 1 100 million bits.

Fourth, compare the size of two numbers in each group. (8 points)

1.64m () 2.37m 0.9m () 70cm 9999999 () 1000000

2.35 yuan () 2.53 yuan 85 minutes () 1 yuan 53090783( )50090783.

5.3 1 m () 5 m 3 m 6 cm 8.47 yuan () 8 yuan 4.5 points.

5. Fill in the appropriate decimal places in the brackets. (8 points)

8 cents = () yuan 6 cents = () yuan 1 yuan 6 cents = () yuan.

4 decimeter = () meter 3 cm = () meter 12 decimeter = () meter.

8 cm = () decimeter = () meter

Six, the number of columns in order from small to large. (4 points)

( 1) 546300 50043600 543006 500346

(2) 12 decimeter, 100 cm, 1.5 m, 1.4 decimeter 2 m.

Seven, judgment. (5 points)

(1) 10,000 bits, 100,000 bits, 1 million bits and 10 million bits are all units of counting. ( )

(2) When reading and writing numbers, start from the highest position. ( )

(3) The number of natural numbers is infinite, and there is no maximum natural number. ( )

(4) The smallest six digits are less than the largest seven digits 1. ( )

(5) The forward speed between two counting units is 10. ( )

(6) Xiao Ming said, "I was born on February 29th, 1992." ( )

The day before Children's Day is May 30th. ( )

The 2008 Olympic Games was held in Beijing, which was a leap year. ( )

(9) Two decimal places must be greater than one decimal place. ( )

(1) 1 is greater than any decimal. ( )

Eight, with two 6, two 4 and four 0 can form an 8-digit number, write the number that meets the following requirements. (6 points)

1, read nothing: ().

2. Read only a zero: ().

3. Read two zeros: ().

4. Read three zeros: ().

5. Maximum 8 digits: ().

6. At least 8 digits: ().

Eight, solve the problem. (27 points)

1.A train departs from A in the morning 10 at a speed of 55 kilometers per hour and arrives at B at 3 pm. How many kilometers is the highway between A and B? (4 points)

On the nights of February and Friday, Xiaohu didn't go to bed until 9 pm. He thought that tomorrow was a rest day and he could get up late, so he set the alarm clock to ring at 8: 00 in the morning. If the alarm clock wakes the tiger on time, how many hours does the tiger sleep? (4 points)

3. Apples are 24.7 kilograms per box and 48.9 yuan per box; Oranges are 38.5 kilograms per box and 72.8 yuan per box. (6 points)

(1) How many kilograms is a box of oranges heavier than a box of apples?

(2) 100 yuan is enough to buy a box of apples and a box of oranges?

4. Uncle Li planted a variety of ornamental vegetables, as shown in the following table: (9 points)

Variety tomato pocket wax gourd pepper

Unit price/yuan 14 16 12

The number of pots sold is 125 148 275.

How much did you buy for each vegetable? (3 points)

(2) What is the income of a * * *? (3 points)

(3) What other math questions can you ask? (3 points)

5. The fruit shop delivers apples and pears 140 boxes, each containing 25 kg and 32 kg. How many kilograms of fruit did the fruit shop send? (4 points)