First, see the topic clearly and think skillfully. (***29 points)
1. Extract the following scores and decimal them. (4 points
8/ 100 7/20 0.625= 3.025
2. Find the common factor and minimum common multiple of the following groups, and write the common factor of each group in ().
Write the least common multiple of each group in []. (4 points)
8 and 12 () 1 1 and 33 ()
[ ] [ ]
3. Solving equations: (8 points)
2X-3/8 = 1-3/8 X-(2/5+3/ 10)= 1/5 X÷ 12.5 = 8 12.7+X = 15.7
4. Calculate the following questions, which can be simplified to 4/5. (9 points)
8-(9/ 16 -7/ 16) 4/5+(3/4 - 1/4)-5/ 12 7/9+8/ 15+ 1/ 15+2/9
5. Divide the contrast size. (4 points)
5/ 14 and 5/ 14 7/30 and 8/45
Second, I believe you can do it. (* * * 30 points)
1 and 1/6 have a true score of () and a minimum false score of (). Adding a fractional unit like () to this false score is the minimum composite number.
Xiaoming's position in the classroom is (5, 3) right. She sits in column () and row (). Xiao Fang sits in front of Xiao Ming, with a (,) numbered pair.
3. Fill in the simplest score in ().
25 seconds = () minutes 30 cm = () meters
45 minutes = () hours 200 kg = () tons
56 square decimeter = () square meter 28 hectares = () square kilometer
4. Wang Cheng walked14km in 3 hours, and AARON Li walked 23km in 5 hours. () faster.
5. Draw a circle with a compass with a circumference of 25. 12 cm. The distance between the two feet of the compass is () cm, and the area of the circle drawn is () cm 2.
6. The common factor of natural numbers A and B is 1, and the least common multiple of A and B is ().
The decimal unit of 7 is (). If you add the unit like (), you get 1.
The common factor of 8, 18 and 45 is (), and their minimum common multiple is ().
9. The sum of all the simplest true fractions with a denominator of 6 is ().
10,6 ÷15 = ()/45 =12 ÷ () = (decimal)
1 1 class and class 5 (4) have 29 boys, and 6 girls are less than boys. Eight people in the class were rated as "three-good students", which accounted for () of the total number.
12. Four skipping ropes with the same length are made of a 9-meter-long rope, so each skipping rope is () meters long, and each skipping rope is () of the total length of the rope.
13, divide it, use 2 to make an appointment twice, and use 3 to make an appointment once. Done. Then the original score is ().
14, if A/ 9 is a false score, then a minimum value is (); If it is a true score, then a is ().
Xiao Fang collected some stamps. He took out half the stamps, gave them to Kobayashi 1 and kept 36 for himself. Xiao Fang originally had () stamps.
Third, please make the right choice. (***5 points)
1, the radius of circle A is three times that of circle B, the circumference of circle A is () times that of circle B ... the area of circle A is () times that of circle B. ..
a、3 B、6 C、9 D、27
2. Add 6 to 2/5 of the numerator. To keep the size of the fraction unchanged, the denominator should be ().
A, add 15 B, multiply by 4 C and divide by 4.
3. Six pairs of children's trousers with the same size were made of a piece of cloth with a length of 5 meters, and each pair of children's trousers was made of this cloth ().
A, 5/6m b, 1/6 C, 13, Wang Cheng left in three hours 14km, and AARON Li walked 23km in five hours. () faster.
4, the first mathematician in the world to the value of pi accurate to six decimal places is ().
A, Liu Hui B, Zu Chongzhi C, Euclid
5. Two 2m-long ropes, the first cut1/5m, the second cut1/5m, and the rest ().
The first root is as long as the second root.
Fourth, trust your own judgment. (***5 points)
1 and 8/5 are not the simplest fractions because the numerator is larger than the denominator. ……( )
2. Regular pentagons can be densely laid. …………( )
3, the equation is not necessarily an equation, the equation must be an equation. ( )
The circumference of a circle with a radius of 2 decimeters is equal to the area. ( )
5. The simplest true fraction is the fraction whose numerator and denominator have no common factor. ( )
V. Look at the picture (***4 points)
6. Find the area and perimeter of the graph. (***6 points)
1, find the perimeter of the shadow part 2, and find the area of the shadow part.
Seven, the use of knowledge to solve problems. (***2 1 min)
1, Zhang harvested 5 tons of watermelons, sold 1/8 on the first day, and sold 2/7 on the second day. How much is left in the total? (3 points)
Both Xiao Lin and Xiao Jun go to the library to borrow books. Kobayashi comes every six days, and Xiaojun comes every eight days. If they meet in the library on July 1, when will they go to the library next time? (3 points)
3. An acrobat rides a unicycle on a suspended steel wire. The wheel diameter of a unicycle is 45 cm. From one end of the wire to the other, the wheel made a full 40 turns. How long is this suspended steel wire? (4 points)
Aunt Zhang sells a batch of clothes. On the first day, 10 pieces were sold, and the second day was twice as much as the first day. At this time, there are 28 pieces left. How many pieces are there in this batch of clothes? (3 points)
5. Both Wang He and Yi * * * have 80 cards. If Wang gives 12 cards and takes out 20 cards to Wang, they have the same number of cards. How many cards do they each have? (4 points)
6. There are 120- 150 teachers and students involved in tree planting in a school. The total number can be divided into 6 or 8 groups. How many people are planting trees in the fifth grade? (4 points)
The answer to the summer homework in the second volume of fifth grade mathematics
1, (6) ÷ (8) = 8 (6) = 3/4 = (16)12 = (0.75) decimal.
The prime factor of 2.204 decomposition is (2×2×3× 17).
3. When two 2 cm long squares make a rectangle, the surface area is reduced by (8) cm.
Of the numbers 4.40, 18,123,370,732, 32 1,120,75, the number divisible by 2 is (40. 18 370 732 18. The number divisible by 5 is (40 370120 75); The number divisible by both 2 and 5 is (40 370 120).
5, 32000M=( 3.2) hectares 6200ml = (6200/1000 = 62/10 = 31/5) l Fill in the score.
6. When the molecule is (0), the fractional value is zero.
7. The decimal unit of 1 1 3 is (13 13), and (15 13) is the smallest prime number.
8. In descending order, 65438+9/03, 7/23, 165438+9/0 and 65438+7/03: (9/1> 9/13 >; 7/ 13 >7/23 )
judge
1 and 2/5 can mean dividing the unit 1 into five parts and taking such two points, or dividing 2 into five parts and taking 1 part. ( × )
If the side length of a square is expanded by 2 times, its volume will be expanded by 6 times. ( × )
3. The simplest score is less than 1. (×)
4. Odd numbers cannot decompose prime factors. ( × )
5. The prime factor of decomposition 15 is: 15= 1×3×5 (×).
1, a two-digit prime number. After exchanging one digit with ten digits, it is still a prime number, and one digit is different from ten digits. How many such figures are there? What is the difference?
13, 3 1 17, 7 1 37, 7379, 97 * * 8.
2. The length of a handicraft box is 3 decimeters, the width is 2 decimeters, and the height is 1 decimeter. Now, three such handicraft boxes are packed together (or cuboids). How many packing methods can you think of? Please calculate the surface area of the most economical wrapping paper. Same packaging is a kind of packaging, ignoring the overlap of wrapping paper. )
Answer: There are three kinds. The most economical one is to overlap the area, so the length and width overlap, and the wrapping paper area =4×2×3+2×3×3=42.