1. There are four classes in grade three in a school, and * * * donated 576 yuan for the disabled, with an average donation of 3 yuan per person. How many people are there in each class on average? 2. Build a road 324 meters long. 240 meters were repaired in the first 8 hours, and the rest were repaired at a speed of 2 1 meter. How many hours will it take to complete? 3. Booking a TV program for half a year requires 15 yuan. Uncle Zhang wants to subscribe to a TV program for three quarters. How much will it cost? Cable TV viewing maintenance monthly 16 yuan. How much is it for the whole year? A pile of coal is planned to burn 45 kilograms a day, which can burn for 32 days. Because of saving coal, it burned for 36 days. How many kilograms of coal are actually burned every day?

1. The road team has built a road with a length of 1500m, and has already built 300m. It will be repaired in the remaining six days. How many meters will be repaired on average every day?

The track of the sports ground is 400 meters, and Uncle Wang insists on running two and a half laps every day. How many meters does he run every day?

3. Xiaoli walks for about 50 cents. She walked 540 steps from home to school. Calculate, how many meters is it from her home to school?

4. Light blue height 134 cm, Dongdong is 5 cm higher than light blue. How many centimeters is Dongdong tall?

5. There are 257 boys and 235 girls in the third grade of Red Scarf Primary School. There are 387 people who have undergone physical examination. How many people have not had a physical examination?

6. The library has lent out 456 books, and there are 207 books left, and now it has returned 285 books. How many books are there in the library now?

7. Red Scarf Primary School bought 380 balls and 70 soccer balls, and borrowed 423 balls during extracurricular activities. How many balls are left in the school now?

8. Class 3 (2) donated 400 books, with 273 books left. Now it has bought 125 books. How many books are there in Class Three (2)?

9. Dongdong wants to buy a 3 10 yuan scooter, which has been deposited in 200 yuan. If he deposits in 30 yuan every month, a few more months will be enough.

10, the students of Dongfanghong Primary School donated 900 books for Project Hope, including 326 story books, 475 science books and the rest comic books. How many comic books are there?

1 1. The side length of a square is 8 cm. If you increase its side length by10cm, how many centimeters will its perimeter increase?

12. The circumference of the rectangular playground is 400 meters, and the length is three times the width. What is the length and width of this playground?

13, with two identical rectangles, 8 decimeters long and 4 decimeters wide. If you put them together into a rectangle, what is the circumference of the rectangle? What is the circumference of a square if it is spelled into a square?

14, Dongdong borrowed a 40-page science and technology book and returned it a week later. He intends to read six pages every day. Can he return it on time?

/kloc-Class 0/5 and Class 3 (2) have 44 people in total. The teacher is going to divide them into eight groups for discussion. How many people are left in each group?

16, a piece of 4-meter-long cloth can be cut into five vests of the same size. How much cloth does it take to make a vest?

17. A baby elephant weighs 4 tons. How many elephants can a large truck with a load 10 ton transport at a time?

18, 632 bags of dry bottles in Hongqi chain store, 385 bags were sold and 200 bags were shipped. How many bags of dry bottles are there in the shop at this time?

19, the school bought 8 10 exercise books, and took them from the first grade 168, and from the second grade 165. How many books are left?

20. The car 10 of a certain train originally had 1 16 people. After arriving at a station, 58 people got off and 45 people got on. How many people were there in this car when we drove again?

2 1, 238 yuan for a VCD and 458 yuan for a scanner. Dad brought 800 yuan. Is it enough?