1, 27? ( 135-35)? In 15, the first step is () method, the second step is () method, and the third step is () method.

2、350? 7+ 15? At the 8 o'clock position, the method () and the method () can be calculated simultaneously.

3. Fill in the appropriate number in □.

□? ( 12? 2)=9, (□+48)? 26-4=0

4. Add parentheses to the following formula to make the equation hold.

10? 4-2-8= 12 5? 6- 10-8=28

5, according to the order of operation, add parentheses to the formula.

(1), multiply first and then add, then subtract: 950-20? 2+72

(2) Calculate subtraction first, then addition and multiplication: 35-25? 30+25

6. Rewrite the following step-by-step formula into a comprehensive formula.

6? 8=48 52+48= 100 12-4=8( )

7. A number is 26 more than half of 48, and this number is ()

8. Add 5 to a certain number, multiply 5, subtract 5 and divide 5, and the result is equal to 5. This number is ().

9. The little monkey should divide 15 peaches into four piles, the number varies, and the most peaches can be pushed ().

10. Half of a rope was used, and the remaining half used more than 2 meters, leaving 17 meters. This rope is () meters long.

1 1, the dividend is three times the divisor, the divisor is 24 less than the dividend, and the dividend is ().

12, the number a is 15, which is three times less than the number b, and the number b is ().

Second, judgment.

1, divide 0 by any number to get 0. ( )

2. If the dividend is enlarged by 10 times, the quotient will also be enlarged by 10 times. ( )

3、25? 15? 25? 15= 1 ( )

4.0 cannot be divided or divided. ( )

Second, the column calculation

What's the difference between 1 and 150 minus 5 and 50?

How much is the product of 2.25 times 16 more than the quotient of 750 divided by 25?

What is the product of the sum of 3,36 and 14 multiplied by their difference?

4, 48 minus 12 times 4, divided by 8, what is the quotient?

How much is the quotient of 5 and 4 divided by 900 more than five times that of 25?

Third, solve the problem.

1, 70kg of flour is brought into the canteen, and the kilogram of rice is three times that of flour. How many kilograms is rice more than flour?

The students took part in the calligraphy competition. Xiaohong wrote 50 words, Xiaohua wrote 10 more than Xiaohong, Xiao Qiang wrote twice as much as Xiaohua, and Xiao Qiang wrote twice as much as Xiaohong.

Two workers of Party A and Party B process a batch of parts in five days. It is known that worker A processes 30 parts per day and worker B processes 25 parts per day. How many parts are there in this batch?

4. The master processes 192 parts per hour, and the number of parts processed by the apprentice per hour is exactly half that of the master. 1 hour * * *, how many parts do the mentoring process?

5. An old man said: Add my age to 12, divide it by 4, then subtract 12 and multiply it by 10, which is exactly 100 years old. How old is this old man now?

6. Miss Wang buys basketball for school, spends * * * to go to 540 yuan, and buys 50 yuan for each basketball.

10 and above, each discount 5 yuan, do you know how many basketballs Mr. Wang bought?

7. There are 48 students in Class One, Grade Four who have taken the Chinese and Mathematics exams, and each of them has achieved excellent results in at least one subject. Among them, there are 38 excellent Chinese students, 40 excellent math students, and how many excellent Chinese and math students?

Math Olympics in the fourth grade next semester (1)

1. Xiaoming misspelled the number 8 in one digit of a multiplier as 3 when calculating an arithmetic problem of multiplying three digits by two digits. The result of multiplication is 2323, but the actual result should be 2828. What are the two multipliers?

2. Four friends, A, B, C and D, go for a spring outing together. At noon, they chipped in to buy five bags of cakes and shared them equally. Party A took out three bags of cakes and Party B took out two bags of cakes, but neither of them took any money. Ding Fang wanted to think, everyone should pay 5 yuan money. Q: How much should A and B recover respectively?

3. Pack a batch of sweets separately. It is planned to pack 40 pieces per box, 15 boxes. Now there are only 12 cases. How many sweets can each box hold on average?

The average age of A, B, C and D is 28 years old. None of the four people is over 30, so what is the youngest?

5. Two bags of glass balls, 68 in one bag and 20 in one bag. Take six pills out of the extra bag and put them in fewer bags at a time. How many times do you have to eat to make these two bags have the same number of glass balls?

6. The fruit shop has 9 boxes of oranges of the same weight. If you take out 20 kilograms from each box, the remaining 9 boxes of oranges are exactly equal to the original 4 boxes. How many kilograms does each box of oranges weigh?

7. There are 195 cars parked in Station A and bilibili. If 36 cars drive from bilibili to Station A and 45 cars leave Station A, then the number of cars parked in Station A is twice that of bilibili. How many cars are parked in Station A and bilibili respectively?

8. The sum of two numbers is 126. Xiao Ming accidentally missed a number added, and the result was 45. What are these two numbers?

9. An express train and a local train depart from A and B, with a distance of 468 kilometers. The express train runs 65 kilometers per hour. Four hours of meeting, how many kilometers per hour is the local train?

10 Learn from Lei Feng's group in Class One, Grade Four and plant flowers in the garden. If everyone plants 16 trees, there are still 24 trees that are not planted; If each race has 19 trees, there are still 6 trees left. How many students are there? * * * How many flowers do you need to plant?