Class name score
First, fill in the blanks. (Per grid 1 min, *** 17 min)
1. 1.7L =()L()mL =()mL
The reciprocal of 2. 83 is () and () of 10/3 is 15.
3. 43 at 1 is () point, and 52 at1km is () meter.
4. In 125, 89, 84, 125,1kloc-0/these numbers, () is the mode of data, and () is the median of data. 5. The descending order is 0.85, 87, 85. 1% and 65:
()& lt()& lt()& lt( )
6. Using 500 soybeans for germination experiment, 22 soybeans did not germinate, and the germination rate of soybeans was (). 7. Add 10g salt to 10g water, and the salt accounts for () of the brine.
8. (As shown in the figure) Stack four regular cartons with a side length of 10 decimeter in the corner, with an exposed area of () cubic decimeter.
9. A rope is 20 meters long. If you cut it off, there will be () meters left.
Second, the judgment question. (Mark "√" for the right and "×" for the wrong) (1 2 points)1. A 15% discount on goods means that the price is 75% of the original price. ( )
2.A number is 3 1 more than B number, and B number is 3 1 less than A number. ( )
3.8÷32-32×8=0 ( )
4. A cube with a side length of 6 cm has the same surface area and volume. ( )
5. If a number other than 0 is multiplied by a fraction, the product must be less than this number. () 6. The surface area of a cube with a base circumference of 8 decimeters is 24 square decimeters. ( )
Third, multiple choice questions. (Fill in the serial number of the correct answer in brackets) (12 points)
1. In the figure on the right, () is not the expanded diagram of the cube.
2. A wire with a length of 76 decimeters can be welded into a rectangular frame with a length of 8 decimeters, a width of 6 decimeters and a height of 1/4 decimeters.
A, 5 decimetres b, 7 decimetres c, 20 decimetres
3. After 5 yuan reduced the price of a shirt, 45 yuan sold it and reduced the price (). a、9% B、 1 1. 1% C、 10% 4。
After the cuboid plasticine is kneaded into a cube, its volume is reduced.
A, big b, small c, unchanged
5. Add a percentage sign after 24, and this number is ().
A. enlarge 100 times B. reduce 100 times C. keep the size unchanged.
6. In the following formula, () is the largest.
a、2+32 B、32×2 C、32÷2 D、2÷32
Fourth, the calculation problem. (35 points)
1. Write the number directly. (8 points)
52+43= 65-65= 3×94= 74÷43= 73+74=
2 1÷87= 1-5 1= 83×76=
2. calculation. (18)
1-52-52 97-(6 1+92) 4÷32÷209
85-4 1÷2 98÷( 15 1÷72) 9 1×24+24×98
3. Solve the equation. (9 points)
X-4 1 = 2 1 X-85X = 15 20% X = 30
Fifth, apply mathematics to solve practical problems. (1 question 9 points, 2-4 questions 5 points, ***24 points) 1. Only formulas don't count.
(1) China has a vast territory, with a distance of 5,500 kilometers from north to south and 5,552 kilometers from east to west. How many kilometers are there between things?
(2) The price of a shirt after a 60% discount is 120 yuan. What is the original price of this shirt?
(3) The oil yield of rapeseed is 42%. How many kilograms of rapeseed does it take to extract 1050 kilograms of oil?
2. Experimental primary schools carry out water-saving activities, and the water consumption in June is 160 tons, which is exactly 85% of the water consumption in May.
, used in May.
How many tons of water?
Class 5 (2) should paint the classroom. It is understood that the length, width and height of the classroom are 9 meters, 6 meters and 3 meters respectively. Paint the ceiling and four walls of the classroom, deducting 40 square meters of door and window area, and need 0.5 kilograms of paint per square meter. How many kilograms of paint does it take to paint this classroom?
There are about 9,600 species of birds in the world, and there are many species of birds in China, about 1300 species. What is the percentage of bird species in China in the world? (Keep one decimal place before the percent sign)