1. The oral calculation is 30×10 =14× 50 = 60× 50 =12× 200 = 3.6+2.3 =1-0.3 =
5000÷5= 2 100÷7= 50÷ 1= 100÷ 100= 0.5+3= 3.7- 1.5=
Second, estimate 83 ÷ 9 470 ÷ 8178 ÷ 6 23× 38 78×19.
Three, written calculation, check with *. 238÷6= 980÷7= 408÷2= *624÷6= *843÷6= 39×27= 25×40= 65×84= 8- 1.6= 1.4-0.8= 6+0.6= 7.3-6.8= 6.5+3.9=
Fourth, off-model calculation.
576÷3÷4 8 1+8 1÷9 1232-232×4 399÷7+294 672÷(2×3)
5. What can I fill in the following ()?
()× 19 & lt； 600 69×()& lt； 5 600 49×()& lt； 7500()×39 & lt； 2400
1. A tortoise lives about 128 years, and a frog lives about 6 years. How many times does a tortoise live longer than a frog?
2. Junior three students go to the park to play, 56 girls and 64 boys. Four students are divided into one group. How many groups can a * * * be divided into?
There are 90 students in Grade Three. Every two students use a desk. How many tables do they need? Put these desks in three classrooms on average. How many people are there in each classroom?
4, a children's TV series ***336 minutes. Divided into 8 episodes. How long does each episode last?
5. There are 46 students in class1* *, and every two students use a desk. How many tables does a * * * need? Arrange these tables in a row every four. How many rows can you arrange them? How much is left?
6. 389 students from Chunyu Primary School went to visit the Natural History Museum by bus. Each car is limited to 45 people. Is it enough to rent 9 cars?
7. The number of adults visiting the Science and Technology Museum is twice that of children. If 456 people visit a * * *, how many children are there?
8, a box of 30 popsicles, each popsicle 3 yuan. Eight boxes of popsicles were sold out in four days. How many popsicles does Uncle Yang sell on average every day? How much did Uncle Yang sell for four days?
9. Xiao Qiang has only had two birthdays this year 1 1. Do you know his date of birth?
10, a train left Beijing at 2: 40 pm and arrived at Shijiazhuang Station on time at 17: 45. How long does this train take from Beijing to Shijiazhuang?
1 1. Yang Yang goes to bed at 9 pm and gets up at 6 am the next day. How many hours did she sleep?
12. A basketball game started at 19: 30 and lasted for 155 minutes. When did the game end?
13. Uncle postman rides a bicycle and travels about 100 meters per minute. How many meters did he walk in 30 minutes? How many kilometers? If it takes two hours to deliver letters and newspapers every day, how many kilometers does the postman have to walk every day?
14, it takes about 600 kilograms of mulberry leaves to raise a silkworm, and it can produce about 50 kilograms of cocoons. There are four silkworms in my family. How many kilograms can I produce? How many kilograms of mulberry leaves do you need? Zhang Cun keeps 40 silkworms. How many kilograms of cocoons can it produce?
15. The weight of elephants increases by an average of 200 kilograms every year. When it was born, it weighed only 100 kg. How much does this elephant weigh in 20 years?
16. A cyclist needs to ride 75 kilometers for training every day. How many kilometers does he need to ride 3 1 day a month?
17, each set of landscape postcards has 12, and the price is 14 yuan. 56 sets of scenic postcards were sold today. How much did a * * * sell?
A square with a side length of 18 and an area of () square meters.
The area of a square with a side length of 100 meter is () square meters, that is, () hectares.
The area of a square with a side length of1000m is () square meters, or () hectares, or () square kilometers.
19, rectangular dining table, desktop length 14 decimeter, width 9 decimeter. How many square decimeters does this glass need to have the same size? There is lace around the glass. How long is lace?
20. The basketball court is 28m long and15m wide. How many square meters is its area? How many square meters is the half court?
2 1, a mirror is 12 decimeter long and 5 decimeters wide. How many square decimetres is its area? The price of this kind of mirror is 2 yuan per square decimeter. How much does it cost to buy this mirror?
22. A watermelon weighs 4 kg, and four apples weigh 1 kg. How many apples weigh as much as 1 watermelon?
23. Li Xiaolin will cut out the largest square from a rectangular paper with a length of10cm and a width of 6cm. What graphics are left? How many square centimeters is its area?
There is a square lotus pond in the garden. Its circumference is 64 meters. How many square meters is its area?
25. Unit: cm
On a square paper with a side length of 10 cm, cut out a rectangle with a length of 6 cm and a width of 4 cm. Xiao Ming thought of three methods (as shown above). What's the remaining area? What about the rest of the circumference?
(1) area:
Circumference:
(2) area:
Circumference:
(3) area:
Circumference:
26. The wall newspaper published by students is 18 decimeter long and 12 decimeter wide. What is the area of the wall newspaper? Stick a lace around the wall newspaper. What is the total length of lace?
27. The wall in front of the classroom is 6 meters long and 3 meters wide. There is a blackboard on the wall, with an area of 3 square meters. Now we must paint this wall. How many square meters is the area to be painted?
28, a sprinkler, 200 meters per minute, sprinkler width is 8 meters. How much water can the sprinkler sprinkle for 6 minutes?
29. A book of Selected Fairy Tales is 6.80 yuan, and a book of Brain is 3.40 yuan. (1) How much is brainstorming cheaper than selecting fairy tales?
(2) Is each book 10 yuan enough?
30. The runway is 400 meters per lap. Xiaohong keeps exercising and runs twice a day. How many meters does she run in a week?
3 1, the swimming lane is 25 meters long. Xiao Ming has swam back and forth three times. How many meters did he swim?
32. A person produces about 37 kilograms of garbage every month. How much garbage does three people in my family produce a year?
Woodpeckers can eat 645 pests every day, and frogs can eat 608 pests in 8 days. How many pests do woodpeckers eat more than frogs every day?
34. Two trucks can transport 9600 kilograms of goods in four times. How many kilograms does each truck transport on average?
35. In Class 3 (1), there are 8 people in the Chinese extracurricular group, 9 people in the math extracurricular group, and 3 people in both groups. How many people are there in the Chinese mathematics extracurricular group?
Yesterday, the shop bought pencils, pens, exercise books, pencil boxes and colored pens, but today, it bought rulers, pens, pencils, exercise books and scissors. How many kinds of goods did you buy in two days?
37. There are 10 bags of soybeans in the tofu shop, each bag is 50 kg, and 1 kg of soybeans can make 4 kg of tofu. How many kilograms of tofu can these soybeans make?
There are five cowsheds in the dairy farm, and there are eight cows in each cowshed. Feed 800 Jin of feed a day. How much feed does each head feed on average?
39. A unit has 620 people going to the hot spring villa for vacation. 1 Bus can take 58 people. 1 1 Can the bus send these people away at once?
40. Xiaohua arrives at school at 7: 30 every morning and goes home from school at 1 1: 50. Arrive at school at 2 pm,/kloc-go home from school on 0/6. How long does he stay at school all day?
4 1, square vegetable field with side length15m. How many square meters is its area? What's the circumference?
42. What is the area of a rectangular broad-leaved forest with a length of 16m and a width of 5m? If 6 kilograms of oxygen can be produced every day, how many grams of oxygen can the broad-leaved forest of 1 square meter produce?
43. A truck can transport eight televisions at a time, three times a day. How many TV sets can you deliver in 30 days a month?
44. There were 8 groups in the 2002 World Cup group match, and each group had 4 teams. There are 736 athletes participating in the competition. How many athletes are there in each team?
45 or 5 boxes of bees can brew 375 kilograms of honey a year. According to this calculation, how much honey can 24 boxes of bees brew a year?
Xiao Ming bought 20 8-corner stamps and 30 6-corner stamps. A * * *, how much is it?