The final exam of the second semester of the 2005-2006 school year, the examination time of the sixth grade mathematics paper: 70 minutes, the topic 123456789 (extra points), dear students, the wisdom journey at the end of primary school is about to begin! As long as you carefully analyze every problem along the way, you will definitely get an unforgettable travel memory. Are you ready? Let's go! First grade. Let me fill in: (2 points for each question, *** 18 points. ) 1, a number is 5 in hundreds of millions, 5 in tens of thousands, 5 in the highest place, and all other numbers are 0. This number is written as (), and the mantissa after omitting hundreds of millions is (). 2, 25% = = = (): 20 = () (fill in decimal places) 3, 6.596596 ... are cyclic decimals, simply denoted as (), and two decimal places are (). The ratio of 4 to 2 is (), and the simplest integer ratio is (). 5. Among the plane figures we have studied, () has the largest number of symmetry axes, including (). 6, coal is a non-renewable resource, an average of 3 tons of coal is divided into 5 parts, each part is 3 tons of coal (). 7. In the natural number of L-20, () is both an even number and a prime number; () is both odd and composite. 8. Xiaohong read a 320-page book. On the first day, she read it The next day, she should start reading from page (). 9. One acute angle of a right triangle is 35, and the other acute angle is (). Scorer 2. I will choose: (fill in the serial number of the correct answer in brackets) (each question 1, * * * each question 4) 1. On a map, 2cm represents the actual distance of 90km, and the scale of this map is (). (1) (2) (3) (4) 2. When two numbers are divided, the quotient is 50 and the remainder is 30. If the dividend and divisor are reduced by 10 times at the same time, the quotient and remainder obtained are (). (l) Quotient 5+3 (2) Quotient 50+3 (3) Quotient 5+30 (4) Quotient 50+30 3. The scientific and technological team used 500 wheat seeds for germination test, and 20 of them did not germinate. The germination rate is (). (1) 250% (2) 3.85% (3) 96% (4) 4% 4, the spelling of 4x+8 is 4 (x+8), and the result is better than the original (). (1) is greater than 4 (2) is less than 4 (3) is greater than 24 (4) is less than 24. Judgment (tick "×" in brackets is correct, tick "×" in brackets is wrong). ) (65438+ 0 for each question, ***4 for each question) 1, and the score with a large fraction unit must be greater than the score with a small fraction unit. The weight of a ping-pong ball is about 3 kilograms. () 3. A circle has countless radii, and they are all equal. () 4. Put 10g salt into 10g water, and the ratio of salt to brine is 1: 10. () shooter four. Calculation: (***26 points) 1. Numbers written directly. (Each question 1, * * * 8)4×= =+= = 6 = 7×=-= = 2. Calculate. (3 points for each question, * *12 points) ① 25×1.25× 32 ②10 ÷ [-(÷+)] ③ (20.2× 0.4+7.88) ÷. (4 points) .a2. Calculate the volume. (Unit: meter) (5 points) Scoring device 6. Only comprehensive formulas or equations are listed, and (2 points for each question, ***6 points) 1 is not calculated, and 25% of a number is equal to 36. What's this number? 2.3.9 What is the product of subtracting the quotient of 7.5 divided by 5 and multiplying the difference by 0.25? 3. The bottom surface of the iron ventilation pipe is 20cm in diameter and 90cm in height. How many square centimeters of iron does it take to make a 100 section ventilation duct? Shooter seven. According to the different conditions given, the formulas are listed separately without calculation. (3 points for each question, 9 points * * *) There are 400 literature books in the library. How many science books are there? (1) The number of literature and art books is the number of science and technology books (2) The number of science and technology books is more than the number of literature and art books (3) The number of literature and art books is equal to 60% of the number of science and technology books. ) 1, rectangular plate, 45 meters long and 20 meters wide. In order to make full use of environmental protection, the biggest circle on this board should be cut off. Would you please calculate the area of this circle? 2. Make the environmental protection granary cylindrical. A cylindrical granary, measured from the inside, has a bottom radius of 2.5 meters and a height of 2 meters. How many cubic meters of rice can this granary hold? If each cubic meter of rice weighs about 545 kilograms, how many kilograms of rice can this granary hold? (Keep the whole kilogram) 3. Planting trees to protect green is an important part of environmental protection. Sanxin village carried out afforestation activities, and five people planted 90 trees. According to this calculation, how many trees have 30 people planted? 4. Statistics on the number of tourists in a tourist city in recent years. (Below) What percentage did the number of tourists in 2000 increase compared with 1998? Compared with 2000, the number of tourists in 2002 increased by a few percent. Sagittarius nine. Ph.D. in Mathematics (plus points, 10) A ship sailed from Port A to Port B, and traveled 96 kilometers in the first three hours. After that, the hourly journey was 1 times of the original, and it took another 2 hours to reach the B port. Find the average speed of this ship. have you finished? Look it up, don't leave any regrets for yourself! Attachment: Reference answer and grading standard: 1. Fill in the blanks (2 points for each question, *** 18 points. ) 1, 5500050006 billion 2, 8 4 5 0.25 3, 6.596 6.604,88:1.5, countless cycles 6,1/57,29, 15 8,/kloc. ***4 points) 1, (4) 2, (2) 3, (3) 4, (3) 3. Judgment (65438+ 0 for each question, ***4) 1, × 2, × 3, √ 4, × 4. *** 12 points) 1100027533.8 ④1(Note: the process is 2 points, and the result is1minute) 3. Solve the equation (3 points for each question, * * 6 points) 1 140 ② (note: flow 2) The drawing should be standardized. 2, 5 points. 2× 2× 2+3.14× (2 ÷ 2) 2× 3 =11.14 (m3) 6. Only comprehensive formulas or equations are listed without calculation. (2 points for each question, ***6 points) 1. Solution: Let this number be X. 25%x=36× 2, (3.9-7.5 ÷ 5 )× 0.253, 3. 1 4× 20× 90 ×1007, (3 points for each question, * * 9 points). ) 1, 3. 14× (20 ÷ 2) 2 = 3 14 (square meters) Answer (omitted) 2,3.14× 2.52× 2 = 39.25 (cubic meters) 90: 5 =: 30 = 540 Answer (omitted) 4, (12-8) ÷ 8 = 0.5 = 50% (18.5-12) ÷12. (96 ÷ 3×/kloc-0 /× 2+96) ÷ (3+2) = 33.6 (km/h) Answer (omitted). 13 1