Fourth grade volume I simple calculation, off type calculation! Winter vacation is coming. There are many problems to be solved, especially simple calculation and off formula calculation,

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• 1. Math problems and answers in grade four of primary school A rectangle has an area of 256 square centimeters. Now, shorten its length by 4 times and increase its width by 4 times to form a square. How long is the side of the square? Thank you. It's a process
• 2. There are 47 children. The teacher should give each of them one red pen and one blue pen. In the store, each pen is 5 pens in a bag or 3 pens in a bag. It is not allowed to open the bag for retail. The red pen of 5 pens in a bag is 61 yuan, the blue pen is 70 yuan, the red pen of 3 pens in a bag is 40 yuan, and the blue pen is 47 yuan. The teacher needs at least 50 yuan to buy the pens
• 3. 8.06=____ ×10+____ ×0.1+_____ ×0.01 8.06=____ ×10+____ ×1+____ ×0.1+_____ ×0.01
• 4. Primary school mathematics, very simple, help 1. It's a slope road from land a to land B. a truck travels 30 kilometers per hour uphill and 40 kilometers per hour downhill. It takes 7 hours to go back and forth. How many kilometers are there between the two places 2. A car runs 120 kilometers in 2.5 hours and runs from a to B for 6 hours at the same speed. If Xiaoguang rides a bicycle from B to a while the car starts from a, the speed and the speed of the car are 1:4. How long does it take for Qiu Xiaoguang and the car to meet? Team a and team B are digging a 620 meter long canal. Team a is digging 3 / 4 of the canal equal to team B's 4 / 5. How many meters more is team a digging than team B?
• 5. A batch of 202 heavy goods are transported by two kinds of vehicles with a load of 6 tons and 8 tons at one time. It is known that there is one more vehicle with a load of 6 tons than that with a load of 8 tons. How many vehicles are needed for each of the two kinds of vehicles? It has been calculated that there will be 15 vehicles with a load of 6 tons and 14 vehicles with a load of 8 tons. I want to say How to make a formula?
• 6. Two super difficult math problems in grade four, please! Practical questions
• 7. 1. Xiaohu walked 1 / 5km in 6 minutes, how many kilometers per minute on average? 2. An engineering team has built a road, which is 2 / 5 of the total length in 6 days. How many parts of the total length can be built every day? According to this calculation, how many parts of the total length can be built in 10 days? (Note: 1 / 5 = 1 / 5)
• 8. The formula calculation of two mathematical problems 1. The tallest animal in the world is giraffe. A giraffe is 5 meters tall, 2 / 3 higher than an elephant. How many meters is this elephant tall? 2. Dolphins can swim 70 kilometers per hour, 1 / 6 faster than southern whales. How many kilometers can Southern whales swim per hour?
• 9. Two math problems The first car and the second car are traveling from the two places at the same time. The second car runs 45 kilometers per hour, and the second car runs 42 kilometers per hour. The two cars meet at the midpoint of 12 kilometers. How many hours after the two cars leave at the same time? 2. A shopping mall participated in the financial insurance, the insurance amount was 40000 yuan, and the insurance rate was 0.75%. Due to the accident, the value of the lost goods reached 6.5 million yuan, and the insurance company compensated 5 million yuan. How many million yuan did the shopping mall actually lose? 2. Change "the insured amount is 40 million yuan" to "the insured amount is 40 million yuan"
• 10. 1. The volume of a cylinder is reduced by 16.8 cubic decimeters by cutting a cylinder into the largest cone? 2. The bottom area of a cylinder and a cone is equal. It is known that the height ratio of the cylinder and the cone is 1:9. The volume of the cylinder is 3 cubic decimeters. What is the volume of the cone?
• 11. The calculation of the calculation (as a reminder: some of you can simply calculate) 4000-3456 (as some of you can, some of you can simply calculate) 4000-3456 (as some of you can, some of you can simply calculate) 4000-34556 \65; (nbsp & nbsp; & & nbsp; & nbsp; & & nbsp; & & nbsp & nbsp; & & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp; & & nbsp & nbsp & nbsp; & & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp; & & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp; & & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp; & & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp; & & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp; & & nbsp & nbsp & nbsp & nbsp & nbsp 1
• 12. Fourth grade volume I off type calculation questions, Also don't be too simple. Such as 1 + 1 + 1 is equal to several!
• 13. Give me 100 times off the formula, It's not the same. It's not the same type. But it's better to make it easy to calculate. Please note again,
• 14. Fourth grade primary school recursive equation calculation (can skillfully calculate to skillfully calculate) urgent! Tell me if I can do it skillfully. If I can, do it skillfully. If I can't, leave it alone 99×199+99+199 67×9＋99×3 （632×5＋632×2＋632）×125
• 15. How to calculate 76 + 85-14 × 8,
• 16. What is disjunction calculation
• 17. In a division formula, the decimal point of the divisor moves one place to the right, and the decimal point of the divisor moves one place to the left
• 18. When Xiao Ming calculates a division, he leaves out the decimal point of a two decimal place. The quotient of 1.5 divided by this number is 130. What are the divisor quotients in the correct formula?
• 19. How to use the simple method to calculate the math problem 135x99 in Volume 2 of grade 4
• 20. A few mathematical problems (four mixed operations) can be simple to simple! 1、3-1/3-1/3÷3 2、15/16+(7/16-1/4)÷1/2 3、1/5÷[(2/3+1/5)*1/13] Urgent ah ah! Can be simple to calculate! To have a process, recursive equation