First of all, fill in with your heart. (1 minute per grid, ***20 points)
1, the distance between the two legs of the compass is 2cm, and the circle drawn with it is () cm in diameter, () cm in circumference and () cm in area.
2, 0.8: 0.4 into the simplest integer ratio is (), the ratio is ().
3, a project, every day to complete its 1/7, four days to complete the project ()/(), the remaining project ()/().
4, circle and square are axisymmetric graphics, circle has () axis of symmetry, square has.
() axis of symmetry.
5, 40% is pronounced as (), converted into decimal (), and the composition number is ().
6. Of the 200 parts produced by Master Zhao, 198 are qualified, and the qualified rate of these parts is ().
7,2/9 and () are reciprocal; The reciprocal of 6 is ().
There are 25 boys and 20 girls in class 8.6/kloc-0. Girls account for ()/() of the class, and boys account for ()% more than girls.
9.A number is 20% more than B number, and A number is ()% of B number.
10, 3/4 of A equals 5/8 of B. If A is 60, B is (). If the number A is 20, then the number B is ().
Second, choose patiently. (Fill in the serial number of the correct answer in brackets) (12 points)
1, "The planting area this year is 1 312" () as the unit "1".
A, this year's sown area b and last year's sown area c cannot be determined.
2. The number of17 greater than 4/5 of 40 is ().
a、49 B、57 C、 15
3. If A divided by B equals 3 divided by 5, then A is B's ().
a、2/5 B、5/3 C、3/5
4. If the ratio of the radii of the big circle and the small circle is 2∶ 1, then the ratio of the areas of the big circle and the small circle is (). a、2∶ 1 B、4∶2 C、4∶ 1
5. The sum of number A and number B is 180, the ratio of number A to number B is 7∶2, and number A is ().
a、40 B、 140 C、360
6. The current price of a suit is 400 yuan, which is lower than the original price 100 yuan, which is lower than the original price (). a、20% B、25% C、30%
Third, calmly distinguish right from wrong. (Draw "√" correctly and "×" incorrectly) (12 points)
1, when two fractions are divided, the quotient must be greater than the dividend. ( )
2. The number ratio of big cows to calves is 4∶3, which means that big cows are more than calves 1/3. ( )
3, 5 tons to increase its 1/5 is 5.5 tons. ( )
4. The diameter of the line segment with two ends on the same circle is the largest. ( )
5, a rope, used 80%, leaving 20% rice. () Of the three numbers 6.π and 3. 14, π is the smallest. ( )
Fourth, be careful. (1 question 4 points, 2 questions 9 points, 3 questions 6 points, * * * 27 points)
1、 1- 1/2= 3/4×8/7= 1/9÷2÷ 1/9= 2×80%=
1/6+5/6= 15÷3/5= 35×3/ 14= 1/2× 1/3÷ 1/2× 1/3=
2. How to make the calculation as simple as possible? (9 points)
1 1/ 18×6/ 17÷22/5 1 ( 1/3+ 1/4+ 1/5)×60 3/8÷(7/ 16- 1/4)× 1/2
3. Solve the equation. (6 points)
x-40%x=4.8 x÷3/4=5/6
4. Column calculation. (8 points)
1, 3/8 of a number is 24, what is this number?
Two fifths of a number minus four equals 60. Find this number.
Fifth, solve the problem. (1 5, the remaining 6, ***29)
1, connected according to the meaning of the question.
There are 60 poplars on campus. How many willows are there?
Poplar is 1/5, 60 × 1/5 of willow.
Willow is 1/5 of poplar.
Willow is more than poplar1/5 60× (1+1/5).
Poplar is more than willow 1/5 60× (1-20%).
Willow is 20% less than poplar (1+1/5).
2. 8/9 students in the sixth grade of Yuhong Primary School participated in the interest activity group, among them, the boy 120, accounting for 3/5 of the people who participated in the interest activity group. How many students are there in the sixth grade?
3. A road maintenance team built a section of highway, the first phase is 30% of the total length, the second phase is 40% of the total length, and there are 900 meters left. How long is this road?
Grandpa Wang saved 5000 yuan in the bank for three years. If the annual interest rate is 2.89%, how much principal and after-tax interest can he get at maturity?
The outer diameter of bicycle tire is about 0.7m.. If it rotates 100 cycles per minute on average, how many meters can it advance in 5 minutes?