1, a number written directly.

1.5 × 4 = 1.6+3.04 = 19.2-0.8= 100×0. 1=

0.2 1× 100= 2.8÷0.7= 5.9÷0.0 1 = 0.24÷6=

3.6×0= 0.6÷0.6= 0. 12 + 8= 0.4×0.6=

1-0.99= 4-0.63= 4.5÷0. 15 = 1÷0.25=

2, column vertical calculation, and keep two decimal places.

9.75× 1.5 1÷6

3. How to calculate it is very simple.

17. 17-6.8-3.2 16.8× 10. 1

3. 12 + 99×3. 12 1.25×3.2×0.25

5.4×[( 1.3+3.5)÷0.2] 10.9-0.9÷0.2+ 1.8

Second, consider filling it out. I can do it.

1. Fill in the appropriate numbers in the brackets below.

150 hectare = () square kilometer 25 cm = () decimeter

0.06 hectares = () square meters 0.8 tons = () kilograms 70 ml = () liters.

2. The number consisting of eight 10, seven 1 and two 0.0 1 is (), and the counting unit of this number is ().

Of the four numbers 3.0.608, 0.680, 0.8 and 0.68, () is the largest and () is the smallest.

4、

(1) According to this rule, the 23rd bead is () color.

(2) Xiao Ming arranges 50 beads according to the above rules, including black () and white ().

5. Fill in "-","-"or "=" in ().

3.74×0.9( )3.74 9.58( )9.58÷0.66 0.85÷ 1.74 ( ) 0.85× 1.74

6. The store recorded the profit of 100 yuan as+100 yuan, so -30 yuan said ().

7. Two decimal places, and the reserved integer is 6. The original maximum value of this decimal is ().

8, a right triangle, three sides are 6 cm, 8 cm, 10 cm, its area is () square cm.

9. The area of a parallelogram is 24 square centimeters, and the area of a triangle with the same height as its base is (). If the bottom is 4 cm, then the height is () cm. It takes 10 and 8 minutes to make 5 parts, with an average of () parts per minute, and each part takes () minutes.

Third, I am the best.

1, 9.80 and 9.8 are equal in size and have different meanings. ( )

2. The second digit to the left of the decimal point is ten; The second place on the right is the tenth place. ( )

3. Multiply two numbers less than 1, and the product must be less than any factor. ( )

If two figures can be combined into a parallelogram, they must be exactly the same. ( )

5. Add "0" or delete "0" after the decimal point, and the size of the decimal point remains unchanged. ( )

Fourth, I am the best.

1. Move the decimal point two places to the left and then three places to the right. The result is ()

A, expand 10 times b, shrink 10 times c, expand 100 times.

2. When students run, Xiao Gang runs 4.8 meters per second, Xiao Ming 10 seconds runs 45 meters, and Xiao Hua 15 seconds runs 80 meters. () runs the slowest.

A, Xiaogang B, Xiaoming C, Xiaohua

3. Draw the parallelogram into a rectangle with perimeter () and area ().

A, larger B, constant C, smaller

4. Read only a zero sign ()

a、30.02 B、3.002 C、300.2

5. The decimal number greater than 0.7 and less than 0.8 is ()

A, 1 B, 9 C, countless

Sixth, I am the first to solve the problem.

1. There are a bunch of steel pipes of the same model piled into a trapezoid, with 7 on the top and 13 on the bottom, one on each floor, and one * * * has 7 floors. How many steel pipes are there in this pile?

2. Convenience store bought 240 bars of soap, which is 1.5 times the number of bars. How many pieces did the convenience store buy?

3. The following is the uniform information of the first-year students in this school: (1) 45 first-year students; (2) The average cloth of each school uniform is 2.3m(3) Existing cloth 100m. Question: Is this cloth enough for everyone to make school uniforms? (Please calculate the description)

4. Monthly water consumption of three households 10: 29.5 tons for Wang family, 8.3 tons for Li family/kloc-0 and 23.8 tons for Zhang family. 10 water fee per ton 1.8 yuan. (1)1What is the water fee of the household with the largest monthly water consumption? (2) How much is the difference between the water charges of the Li family and the Wang family?

5. Make a small red flag with a right triangle at the bottom and a height of 6 cm with a square red paper with a side length of 90 cm. How many noodles can you cook at most?

6. The area of a triangle is12cm2. What is the base and height of this triangle? Try this list and see what happens.

7. The length of a green space is16m, the width is 8m, and there are two lanes 2m wide in the middle. What is the green area of (1)? (2) Each cement brick is a square with a side length of 1 m.. How many cement bricks do you need to pave the road?