Math problems in grade five 1. On second thought, I filled in 1. Students use the transformations of (), () and () in geometry to design many beautiful patterns. 2, () cubic meters = 105 cubic decimeter = () liters. 3. Fill in the appropriate units: ① A bottle of mineral water is about 500 (); ② A bottle of eye drops is about10 (); ③ The volume of cargo container is about 5 (). 4. Natural numbers (except 0) can be divided into (), () and () according to the number of factors. 5, a five-digit number, the highest digit is the largest digit, the digit on the tenth digit is the smallest prime number, the digit on the tenth digit is three times that on the tenth digit, and the digit on the hundredth digit is 2 larger than the digit on the th digit. This five-digit number is (). 6. The length of a cube is 48 cm and the volume is () cubic cm. 7, a rectangular pool, 6 meters long, 3 meters wide and 3 meters deep, covers an area of (), its volume is (). 8. Put two cuboids with the same size into a cube. The side length of this cube is 10 cm. The original volume of a cuboid is () cubic centimeters. 9. Cut the 12m-long iron wire into 6 sections on average, each section is () of the total length, and each section is () meters. 10, the fraction X/5, when X= (), is the decimal unit of this fraction; When X= (), it is the maximum true score; When X= (), it is the smallest mistake; When X= (), it can be reduced to zero. 1 1, one wire was cut by 3/5 meters, and the rest was more than 3/5 meters. This wire used to be () meters long. 12, 9/ 10, 0.89, 3/4, 6/5, 0.7, 8/9 in descending order: () ∞ () ∞ () ∞ ()14, a number in hundreds of thousands of digits. This number is written as (). 15, a two-digit number is a multiple of 2, 5 and 3 at the same time. The maximum value of this two-digit number is () and the minimum value is (). Second, carefully choose 1, and rotate and translate just to change the graph (). A, size b, shape c, position d, direction 2. Fold a rectangular piece of paper four times in a row, one of which is paper (). a、 1/4 B、 1/8 C、 1/ 12 D、 1/ 16 3。 The side length of a square is prime, and its area must be (). A, prime number b, composite number c, even number d, odd number 4, and the largest three digits are multiples of 2, 3 and 5 at the same time. a， 120 B，990 C，960 D，930 5。 Cut a cube bread with a side length of 4m into cube buns with a side length of 10cm, and you can cut at most () pieces. A, 4 B, 16 C, 32 D, 64 6, Xiaoming arrives at school 38/7 minutes before class, Xiaohong arrives at school 5.4 minutes before class, and Xiaogang arrives at school 163/30 minutes before class. () Go to school first. A, Xiaoming B, Xiaohong C, Xiaogang D, and uncertainty III. True or false 1. A square has two axes of symmetry. () 2. Cuboid is a special kind of cube. () 3. Any nonzero natural number has at least two factors. () 4.A is a multiple of B, and the greatest common factor of A and B is B. () 5. A fraction whose numerator and denominator are prime numbers is called simplest fraction. () 6. The relationship between the fraction expressed by letters and division is: A/B = A ÷ B. () 7,3/24 cannot be reduced to a finite fraction. () 8. You cannot write a score greater than 1/9 and less than 1/8. () 4. Calculate 1 and directly write the number 0.125+7/8 =1/3+1/4 =1/9 = 2/7-. 9-1/9 = 2/7+2/5 = 9.8 ÷ 0.01= 3.4+13 =1.08+1/2 = 5/8. Why? ① 250ml/2.00 yuan; ② 500ml/4.60 yuan; ③ 1L/9.00 yuan 2. Spread a layer of 5 cm thick sand on a rectangular plot with a length of 45 meters and a width of 28 meters. If a car can only transport 3.5 cubic meters of sand at a time, how many times must the car transport it at least? 3. A cuboid wood with a length of 1.2m and a cross-sectional area of 20 square decimeters. Find the volume of this wood. 4. Sun Yan's family has some eggs, including five numbers of 5, six numbers of 6 and 12, all of which are more than four. These eggs are known to be between 100 and 130. Do you know how many eggs Sun Yan's family has? 5. There is a coal yard. On the first day, 13 tons of coal was sold. The second day sold less than the first day 1/4 tons. The second day sold 3/5 tons more than the third day. How much coal was sold on the third day? The decimal units of 1 and 2/9 in the fifth grade math problem are (), and it has () such decimal units, plus () such units is the smallest prime number. 2.① 7.2 cubic decimeter = () cubic centimeter ② 5 liters = () milliliter ③ 2 10 minute = () ④ 64 square kilometers = () hectares ③ Divide a 7-meter-long rope into four sections on average, and each section is () meters of this rope. 4. If A=2×3×5 and B=2×2×5, then the greatest common factor of the numbers A and B is () and the smallest common multiple is (). 5. A simplest true fraction, the product of numerator and denominator is 5 1, and this fraction may be (). 6.18 ÷ () = 6/25 = () ÷125 = () [Fill in decimal places] 7. In 3/7, 8/ 13 and 7/20, what can be converted into a finite fraction is (). 8. At least () identical small cubes are needed to form a larger cube. 9. The total length of a cube is 36 meters, its length is () meters, its surface area is () square meters, and its volume is () cubic meters. 10, the simplest true fraction with the denominator of 10 is (). 1 1,14500mm3 = () m320.85dm3 = () c373cm3 = () ml450l = () ml12. If 675□4 is a multiple of 3, then □ can be filled in at least. 13, decompose 2 10 into prime factors: (). 14. Among natural numbers less than 10, () and () are two adjacent numbers, which are prime numbers, and () is two adjacent numbers, which are composite numbers. 15, data 12, 13, 15, 14, 15, and the median of 0 is (). 2. Judging (tick "√" for the right and "×" for the wrong), only one score is 1, less than 1/6 and greater than 1/8. () 2,5/8 tons can be expressed as either 5/8 of 1 ton or 5 tons of 1/8. () 3. The side length is a square with a natural number, and the perimeter must be a composite number. () 4. The surface area of a cube with a side length of 6 cm is equal to its volume. () 5. There is a cuboid and a cube, and their volumes are equal, so their surface areas must be equal. () 6. The side length of the cuboid is expanded by 2 times and the volume is also expanded by 2 times. ..... () 7. True scores are all less than 1, and false scores are all greater than 1. () 8, 1 kg 1/5 and 2kg110 are as heavy. ..... () 9. Because 5/ 13 = 10/26, the fractional units of 5/ 13 and 10/26 are the same. ...... () 10, my mother bought a cake, and our family shared it, and everyone ate 1/3. ..... () three. Multiple choice questions (choose the serial number of the correct answer and fill in the brackets) 1. A cuboid whose length, width and height are 4cm, 3cm and 2cm respectively, then its volume is () ① 12cm, ② 24cm and ③ 36cm 2. In the following group, it is a prime number. ① 6 and 5 1, ②7 and 2 1, ③ 9 and 19, ④ 13 and 26 3. There are () simplest true fractions with the unit of fraction 1/6. a、2； b、3； c、4； D, 6 4, after a cube is divided into two small cuboids, the surface area (). A, unchanged; B, bigger than the original; C is smaller than the original 5, A and B are natural numbers, and a=4b, then the greatest common factor of A and B is (), and the smallest common multiple is (). ① 4, ② b, ③ a, ④ ab 6, among the following groups of numbers, only two numbers whose common factor is 1 are (). ① 13 and 9 1, ② 26 and 18, ③ 9 and 85, ④ 1 1 and 22 IV. Calculate 1, and write directly (10)1/2+2/3 = 0.8+4.2 = 7/8+3 = 2/5-1. 39 = 1-5/ 19 = 7.7+3/ 10 = 12/5-2 = 5-9/ 16 = 1/ 100- 1/ 1000 = 1/ 1 00+100 ①14/15-(6/15+1/3) ②13/5-0.81- The sum of two numbers is 4/7, and one of the addends is 1/. 2.5 times x times the product of 26 and 2, and the sum is 1 13. Find x and sixth, solve the problem. 1, a cubic oil drum, measured from the inside, with a side length of 0.8 meters, how many liters is its volume? 2. There are 9 boxes of biscuits, and the weight of 8 boxes is up to standard, of which 1 box mixed 10g. Now, how many times can you find out the unqualified box by weighing it with a balance? 3. A rectangular iron sheet (as shown below), cut a square with a side length of 5 cm from each of the four corners, and then make a box. What is the bottom area of this box? How many liters is its volume? In the fifth grade, math problem 31, fill in the blanks 1, 7020 square decimeter = () square meter 2, 4.5 hours = () hours () minutes. The factor of 3 and 48 is (), and the prime factor of 48 is (). 4. The unit of score is 1/7. The maximum true score is (), and the minimum false score is (). 5. The numerator of the simplest fraction is the smallest prime number, the denominator is the composite number, and the maximum fraction is (). Add the decimal unit like () and you get 1. 6. A cuboid with length, width and height of 8 decimeters, 5 decimeters and 10 decimeter respectively, with a surface area of () square decimeter and a volume of () cubic decimeter. 7. The greatest common factor of two numbers is 8 and the least common multiple is 48, where one number is 16 and the other number is (). 8.A=2×3×5×7, B=3×5×5×7, the greatest common factor of A and B is (), and the smallest common multiple is (). 9. When the side length of a cube is doubled, its surface area is expanded by () times and its volume is expanded by () times. Compared with 5/ 10, 4/9 and 5/ 1 1, () has a larger decimal unit and a larger fractional value. 1 1, a 96 cm long wire can be welded into a rectangular frame. The frame is10cm long, 6cm wide and () cm high. 12. To make a big cube with a length of 1cm and a length of 4cm, at least () small cubes are needed. 13,3/8kg means to divide () into () parts on average, that is, three parts like this. 14, five 1/4 are written as false scores (), and the band score is (). Second, the multiple-choice question (fill in the serial number of the correct answer in brackets) 1, in 2/3, 3/20 and 7/28, () can be reduced to a finite decimal. 13 22 3 1 2, the product of the multiplication of two prime numbers must be () 1 addend 2, even number 3, and a = 5b (both a and b are non-zero natural numbers). The following statement is incorrect: the greatest common divisor of () 1A and b is the smallest common divisor of A2A and B. When 100 g water is added to 100 g salt, the salt accounts for () ①1/9②10③115 of the brine, which is called a >. 0), then compare 2/a and 2/b () ① 2/a > ② 2/a.