The mathematics midterm examination paper in the sixth volume of primary school [time: 80 minutes, full mark: 100] scored _ _ _ _ _1. I am full of confidence and fill in the blanks smoothly. (per grid 1 minute, ***20 points) 1. If a×3 = b×4 = c×5, then a: c=( 5 ):( 3). 2. The statistical chart can clearly show the relationship between the quantity of each part and the total. 3. In a proportion, the product of two external terms is, and one of the internal terms is, then the other internal term is (). 4. The total price is fixed, the quantity and unit price are in (inverse) proportion, the proportion is fixed, and the distance on the map is in (positive) proportion to the actual distance. 5. Cut a cylindrical steel with a length of 1m and a bottom diameter of 2 decimeters into two small cylinders, and the surface area is increased by (6.28) square decimeters. 6、X+Y = 600，X:Y =，X =(240)，Y = (360)。 7.0.75 = (3): (4) = (-) = (75)% 8. The distance of 20cm on the map indicates the actual distance10km, and the scale of this map is (1: 50000). 9. The volume of the cone is 48 cubic centimeters, the height is 8 centimeters, and the bottom area is (18) square centimeters. 10, 2 hours =(2), (40) 3 tons, 70 kg =(3.07) tons. 1 1. The radius of the bottom surface of the cylinder is 10 cm, the height is 2.5 cm, the circumference of its side development diagram is (130.6 cm), and the side area is (157 cm). Second, critical and accurate judgment. (tick "√" for the right and "×" for the wrong, * * *10)1cannot be converted into a finite decimal. (×) 2. The volume of a cone is the volume of a cylinder with the same height as its bottom surface. (√)3. If 3a=5b, then a: b = 5: 3. (√)4. The area of a circle is directly proportional to its radius. 10. 5. After a number is increased by 25%, it is reduced by 25%, and the original number is still obtained. (×)6. Natural numbers are either prime numbers or composite numbers. (×)7. The circumference of a rectangle is fixed, and its length and width are inversely proportional. (×) 8. If two internal terms of a proportion are reciprocal, then its two external terms are reciprocal. (√) 9. The side length of a cube is 5cm, and its surface area is125cm. (x) 10, and the formula composed of two ratios is called proportion. (10) Third, choose carefully and correctly. (65438+ 0 for each question, * * 10) Put 1 g of drugs into 1 00g of water, and the ratio of drugs to liquid medicine is (c). a、 1:99 B、 1: 100 C、 1: 10 1 D、 100: 10 1 2。 Let c be a circle. A, radius b, diameter c, area d and circumference 3 of a circle. For a project, team A needs 8 days to do it alone, and team B needs 10 days ... The work efficiency ratio between team A and team B is (b). A, 8: 10 B, 5:4 C,: d, 4: 54 and if 25% of the number a is equal to the number b, then the number A (b) is the number B..a, which is greater than b, less than c, and equal to d, so it is impossible to determine 5, a semicircle figure with a radius of r and a circumference of (d). A, ×2πr B, πr+r C, πr D, (2+π)r6 reflect both quantity and quantity increase and decrease, and (c) is the best choice. A, statistical table b, bar chart c, line chart d and fan chart 7, a and b are 900km apart, and (c) cm should be drawn on the plan with the scale of 1: 6000000. A, 5 B, 10 C, 15 D, 25 8, a cylinder and a cone have the same volume and bottom area. If the height of the cylinder is 6 cm, the height of the cone is (d). a，2cm b，3cm c，6cm d， 18cm 9。 The relationship between x and y is (c). A, x+y=k (certain) b, x×y=k (certain) c, =k (certain) d, x-y = k (certain) 10, ×6÷6(C). a， 1 B，c，36 D，0 4。 Patience and meticulous, careful calculation. 1, write directly. (*** 10) × = 5-= 5 ÷ 80% =10.125× 32 = 41÷ = 2 (+)× 40 = 38 × (***4 points) =: = x: 93, off-type calculation. (*** 12) ① 3.68× [1÷ (2–2.09)] ② [-0 ÷ (+) ]×1③1×+42+6544. (* * * 6 points) The statistics of breakfast varieties that sixth-grade students in a school like are as follows: bread, yogurt, puffed food, eggs, boys 168 124 girls 186 168. Make a histogram according to the data in the above table. Statistical chart of breakfast varieties liked by sixth-grade students in a school 2010 April system 6. Think carefully and answer completely. (***28 points) 1. The weight ratio of copper to tin in Cu-Sn alloy is 5∶7. There are 3500 kilograms of copper now. How much tin does it take to make this alloy? Solution: Suppose that X kilograms of tin are needed to make this alloy. 3500: x = 5: 72, a cylindrical pool with a diameter of 20m and a depth of 2m. (1) Lay a layer of cement on the edge and bottom of the pool. What is the surface area of cement? (2) How many cubic meters does it take to dig this pool? 3. There are two cylinders with equal base radii, and the height ratio is 3:5. The volume of the first cylinder is 48 cubic centimeters. How many cubic centimeters is the volume of the second cylinder more than that of the first cylinder? 4. Conical sand pile with a bottom area of 12.56 square meters and a height of 1.8 meters. Use this pile of sand to pave a road with a thickness of 2 cm on a road with a width of 10 meter. How many meters can it be paved? 5. The rectangular playground is150m long and120m wide. Draw it on a certain scale. How many centimeters should I draw the length and width? 6. Mix 2 Jin of butterscotch from 8.4 yuan, 3 Jin of fruit candy from 5.6 yuan and 4 Jin of crisp candy from 6.9 yuan into assorted candy. How much is this assorted candy per kilogram?