Class name score
Dear students, mathematics is useful in life. Using mathematics to guide life can make everyone have a smarter mind and a finer life arrangement. Are you ready? Let's go!
First, I will fill it out. (per space 1 min, *** 12 min. )
1. Divide the whole "1" into 100 parts on average. The number representing 30 parts is expressed as a fraction () and as a percentage ().
2.34.7% reading: (), 120% writing: ().
3. Five (2) The number of girls accounts for 47% of the class, and the number of boys accounts for ()% of the class.
Of the 4.500 products, 25 are unqualified, and the qualified rate is ().
5. The number of students in a class today is 49, lacking 1, and the attendance rate of this class on this day is ().
6. Class 5 (1) planted 200 trees on Arbor Day, and 196 trees survived. The survival rate of these trees is ().
I sold a batch of clothes in July and September, 28% in June, 438+ 10, and ()% in two months.
8.=()⊙()=()% = () (Fill in decimal places)
Second, I will judge. (Mark "√" for the right and "×" for the wrong. ) (10)
() 1. If the attendance rate is 99%, it must mean that there are 99 people present.
() 2. The experiment on 105 seeds showed that 100 seeds germinated, and the germination rate was 100%.
3.400 tons is 50% of 800 tons.
The number of girls in the first and second primary schools accounts for 49% of the total number of students in our school. The number of girls in these two schools must be equal.
() 5. Dissolve 20g of salt in100g of water. At this time, the salt content of brine is 20%.
Third, choose the serial number of the correct answer and fill it in brackets. (6 points)
1. Among the following figures, the smallest is ().
a、33.3% B、C、0.33 D、3
2. The number A is 80% of the number B. If the number A is 40, then the number B is ().
a、80B、3200C、60D、50
A book has ***200 pages. After reading 20 pages, there are ()% left.
A, 180 b, 80C, 90D, cannot be calculated.
Fourth, answer as required. (***34 points)
1. Fill in the form completely. (8) Integral
Percentage 125%
mark
Decimal 0.45
2. See who can calculate quickly and accurately. (9 points)
30×30%= 8×25%= 80%×90%=
30÷30%= 8÷25%= 60×( 1-40%)=
60÷( 1-40%)= 48÷( 1+20%)= -25%=
3. Solve the equation. (12)
20% y = 30χ+χ= 60( 1-55%)m = 90
4. Reasonable packaging. (5 points)
How can we save wrapping paper by packaging three biscuit boxes as shown below into one package? (excluding interface)
Five, solve the problem (including the second question 8 points, ***38 points. If one of the problems is solved by an equation, you can add 1 minute. )
1. protein content table in food
Milk, eggs, lean pork, corn and peas.
2.5% 12.3% 18. 1% 8.6% 24.6%
Use the data in the table above to find out how many grams of protein are contained in 300 grams of corn and 400 grams of milk.
2. Please complete the attendance statistics of each class in Grade Five.
Class grade (1) (2) (3) (4)
Class size 50 565 438+0 50 49
Attendance
The attendance rate is 100%
Answer: Which class has the lowest attendance rate? Which classes have the same attendance rate?
3. A class finally selected 6 "three good students" and 8 "excellent players", accounting for 35% of the total class. How many people are there in this class?
A pile of yellow sand weighs 400 tons. It was shipped on the first day and 30% on the second day. How many tons are left?
5. Mom bought 2 barrels of dragon fish oil (63.5 yuan per barrel), 25.3 yuan of apples, 18 yuan beef and 2 1. 1 yuan of rice in the supermarket. Please estimate whether mom has enough money with her.
6. shop reasonably.
1) 1.5 liter yogurt how many ways can I buy it?
2) How to buy 2.4 liters of yogurt?