1, in the formula without brackets, there are multiplication, addition and subtraction, all of which must be calculated first () and then ().
2. In the formula without brackets, division, addition and subtraction () must be calculated first.
3. In the formula without brackets, only () or only () is calculated from left to right.
4.A number is less than B number 15, B number is 30, and A number is ().
5, 85 minus 13, the difference is (), then divide by 9 to get ().
6. A story book has 40 pages. After reading 8 pages, I will finish reading it in 4 days. Ask for an average of several pages a day. You must work out () first.
7. Fangfang has some stamps. After using 18, there are 6 stamps left, not ().
2. Is the following calculation correct? Correcting mistakes.
4×8÷4 75— 18+36
=4×2 =75—54
=8 ( ) =2 1 ( )
26+2×8 15+28÷7
=2×8 =43÷7
= 16 ( ) =6…… 1 ( )
Third, judge:
1 and 63÷9+27 should be counted as 63÷9 first. ( )
2、9×4+6=90 ( )
3. To make 6×(5)= 48, 3 should be filled in the box. ( )
Fourth, the application problems:
1, Guanghua Road Primary School bought 1 volleyball and four shot puts to go to 42 yuan. If a volleyball 18 yuan, how much is each shot put?
There are 8 rows of apple trees, each with 8 trees. There are more pear trees than apple trees 10. How many pear trees are there?
3. The production team received 38 production tasks in the morning and 34 in the afternoon. Distribute these tasks to eight groups equally. How many pieces did each team produce? There are three people in each group. How much is the average share per person?
A story book has 85 pages. Xiao Ming read 6 pages a day for 9 consecutive days. How many pages did Xiao Ming read? How many pages are left in this book?
The school bought 40 pots of chrysanthemums and 6 classrooms, with an average of 6 pots in each classroom, and the rest were kept in the office. How many pots of chrysanthemums are there in the office?
6. The road team built a 60-meter-long road, 42 meters in the first three days, and it was completed in the remaining two days. How many meters are repaired on average every day?
In the second grade, there are 36 vans in the parking lot, which is 4 times less than vans 19. How many cars are there?
Uncle Wang collected 207 baskets of watermelons in the morning, and the number of baskets collected in the afternoon was 56 times that in the morning. How many baskets were collected in the afternoon?
3. A shop bought 7 boxes of apples, each weighing 8 kilograms, and 44 kilograms of pears. A * * * bought thousands of fruits?
4. Watch the dolphin show on 1 0/day. There are two games on Saturday, each with 203 people and 396 people on Sunday. How many people are there in two days?
Xiaohong has eight books, and Xiaogang's books are four times as many as Xiaohong's. How many books do two people have?
6. Little Red Flower bought a schoolbag from 50 yuan and five pens from 45 yuan. How much is the schoolbag cheaper than the pen?
7. The fruit shop sent 500 Jin of fruit, sold it for 7 days, and there were 325 Jin left. How many kilograms are sold on average every day?
8. Xiaogang's family of three picked 45 apples, while Xiaoli's family of three picked an average of 10 apples. How many more apples did Xiaogang's family pick than Xiaoli's?
9. A bus can carry 62 passengers, and a bus carries less passengers 18. How many passengers can eight buses carry?
10, the teacher bought 6 boxes of chalk, 8 pieces in each box, and gave them to the students 12. How much is left?
The application of mathematics mixed operation in grade two is 3 1. Students stand in a row to do exercises, and boys stand five times, with 28 people in each row. The number of girls is half that of boys. How many girls are there?
2. Xiaoming and Xiaohong arrange photos. One * * *, 232 photos, two lines per page. Each row can hold four photos. How many pages do you need?
Put five pears on both sides of the balance, a pear and a pineapple on the right. At this time, the balance is balanced. The weight of a pear150g. How many grams is a pineapple?
4. A rectangular playground is 40 meters long and 32 meters wide, which is four times that of Wang Huaran. How many meters did he run?
There is a willow tree every 9 meters on one side of the road. Five minutes after seeing the first willow by car, Liang Xiao saw 50 1 tree. How many kilometers does this car travel per hour?
6. The school has a rectangular garden against the wall, which is 19 meters long and 7 meters wide. There is a fence around the garden. How many meters at least?
There are 252 notebooks, which are packed in four big boxes and nine small boxes respectively. It is known that there are as many as three small boxes in a big box, so how many are in a big box? How many copies are there in a small box?
8. Arrange three squares with sides of 6 cm, 5 cm and 4 cm in descending order. What is the circumference of this figure?
9. There are two baskets of pears. Take six pears from the first basket and put them in the second basket. At this time, there are 128 pears in the second basket, which is twice as many as that in the first basket. How many pears are there in each basket?
10, my brother is 8 years old and my brother 16 years old. Both brothers are 44 years old. How old is my brother? How old is my brother?