Class: Name: Grade: Time: 60 minutes

First, a small knowledge window shows my powerful skills.

1. There are X girls in the school, with 200 more girls than boys. There are () boys and * * * students ().

2. The associative law of adding letters is (), and the associative law of multiplying is ().

3、72÷(9×4)=72÷( )○( )

4. 1 rounded corner = () flat angle () right angle.

5. Any triangle is () high, and the sum of internal angles is ().

6. As shown, ∠2= (), ∠3= (), ∠4= ().

7.174× 99+174 =174× (□ +□) Use multiplication ().

8. From 5: 00 to 5: 00 10, the minute hand turned () degrees.

9. The base angle of an isosceles triangle is 30 and the top angle is (). From the point of view, this is a

() triangle.

Second, the little judge skillfully decided the case. (Tick √ for the right and × for the wrong)

1. The side length of a square is acm, so when a=2, its perimeter and area are equal. ( )

2, x2 represents 2 times of x. ()

3、 125×27×8×2=( 125×8)+(27×2)。 ( )

4.87× 10 1=87× 100+87.( )

5. An angle greater than 90 is an obtuse angle. ( )

6. The longer the side of an angle, the bigger the angle. ( )

7. An isosceles triangle must be an acute triangle. ( )

Third, choose carefully. (Put the serial number of the correct answer in brackets)

1.465+500+535 = 500+(465+535) Use addition ().

A. commutative law B. associative law C. commutative law and associative law

2. A book has x pages. Xiao Gang has been reading it all day, reading 8 pages every day. How many pages are left?

The following formula is correct ()

A.8x+a B.x+8a C.x-8a

3. A building has 25 floors, each floor has 18 windows, and each window has 4 pieces of glass. This building is too * * *

How many pieces of glass are there? The correct formula is ()

a . 25×( 18+4)b . 25× 18×4 c . 25× 18÷4

4. The following three line segments in each group can form a triangle (). (Unit: cm)

2 1.3

5. In a triangle, one angle is 65, and the other two angles may be ().

A.95，20 B.45，80 C.55，70

6. When applying multiplication and division, the following error is ()

a . 39×62+39×38 = 39×(62+38)= 39× 100 = 3900

b . 10 1×75 =( 100+ 1)×75 = 100×75+75 = 7500+75 = 7575

c.23×99=23×( 100﹣ 1)=23× 100+23=2300+23=2323

Fourth, I am a little painter.

1. Draw the corner below.

30 90 150

2. Draw the height at the bottom of each triangle.

Five, how to calculate as simple as possible.

25×7×8 420÷4÷5

35× 102 56×67+33×56

48×25