2. Fill in the appropriate fraction or decimal in ().

0. 18=( ) =( ) =( ) 0.009=( )

3. A sparrow weighs about 0. 106g, where 1 in 0. 106 is at () position, indicating (), and 6 is at () position, indicating ().

Hundreds and percentiles are all 5, and the rest are all 0. This number is ().

5. Write 7.79 139 13 ... as (), and keep one decimal place as ().

6. Fill in the appropriate decimals in the brackets.

8.5 cents = () yuan 1 kg 45g = () kg.

12m 5 decimeter = () m 15 decimeter 2= () m2

7, than the size.

0.75○0.8 5.6÷0. 1○5.6 7.82○7.82×0.6

8. As shown on the right, a quadrilateral can be divided into two triangles; Pentagon can be divided into three triangles: hexagon can be divided into four triangles. Then, a polygon of 10 can be divided into () triangles.

My son is one year old and my father is five times as old as my son. My father is () years older than my son.

10, the exchange rate of RMB against the US dollar on a certain day is 100 US dollars, which can be converted into RMB 80 1.97 yuan. In this way, it takes RMB () yuan to exchange 10000 USD.

1 1, triangle ABC, ∠ A = 39, ∠ B = 54, ∠ C = (), which is a () triangle.

Second, judge.

1 and 0.424 The leftmost 4 represents four 0. 1 and the rightmost 4 represents three 0.005438+0. ( )

3 cm, 2 cm and 6 cm sticks can be placed in a triangle. ( )

3. Add "0" or remove "0" after the decimal point, and the decimal size remains unchanged. ( )

4,2a+3.2 = 3.2 is not an equation. () 5,4.525252 is a cyclic decimal. ( )

Third, choose carefully, I am the best.

1, in the following figures, the size remains unchanged after removing 0: ()

A.8.05 B 0.090 C 600 D 2 1.00

2. Among the following formulas, only () is an equation:

A.4a+8 B.6b-9 > 12 C.3-x+5 D. a ÷2=4

3. Move the decimal point to the right first, and then move it two places to the left. This decimal point

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

4. The picture below () is what Binbin saw.

A, B, C,

5. In the game of playing rock, paper and scissors, the opponent ().

A is easier to throw stones; B it's easier to throw cloth.

C scissors difference is more likely, and D scissors difference is equally likely.

Fourth, I will calculate:

1. Write directly.

13.4-8= 6.6+4= 23+4.7= 10-2.3=

7.5×4= 2.3×4×0= 100÷40= 3.5÷5=

0.6-0.23= 0.34+0.45= 0.06×0.7= 0.05× 1.6=

2. Use vertical calculation.

4.85×0.73= 25.73÷8.3= 9-5.48= 56.7÷0. 14=

3. Solve the equation.

6X = 24 4y-24 = 16 2.5x÷6 = 2.5 3X+2.4X = 10.8

Sixth, solve the problem.

1. At the get-together, the teacher bought 2.4 yuan's 18 prize and 0.8 yuan's 38th prize. How much did the teacher spend?

2. A promotional activity was launched in Rainbow Shopping Mall, and a box (24 boxes) of milk was bought for 45.6 yuan, and a dozen (8 boxes) of milk of the same brand were bought in Renrenle Shopping Mall 18 yuan. Which shopping mall has cheaper milk?

3, the fourth grade to participate in children's performances, making clothes. A garment needs 1.8m and 18.9m fabrics. How many sets can you make?

4. List the equations and answer the following questions:

*** 10.8 yuan x per catty 1.5 yuan.

19.8 yuan