1, Xiaoming borrowed money from 20 yuan, and after spending X yuan, he still had (20-x) yuan left.
2. The greatest common factor of12 and 18 is (6); The least common multiple of 6 and 9 is (18).
3. Divide the 3m-long rope into 8 sections, each section is 0.375m, and the total length of each section is 1/8.
4. Xiaohong's position in the classroom is (5,4) right. She sits in the fifth column and the fourth row. Xiaoli's position in the classroom is column 5, line 3, and the number is (5, 3).
5. The smallest three digits that can be divisible by 2, 3 and 5 at the same time (120); The maximum number that can divide 6 and 8 at the same time (2).
6. If a÷b=8 is (and both A and B are not natural numbers 0), their greatest common factor is (b) and their smallest common multiple is (a).
7.(A is a natural number greater than 0), when A is a true fraction, when A is a false fraction, and when A is equal to 3. An incomplete theme
8.= =()⊙9 = 44⊙ () The question is incomplete.
9. Fill in the appropriate scores in the brackets.
35 cubic decimeter =(7/20) cubic meter 53 seconds =(53/3600) 25 hectares =( 1/4) square kilometers.
10, among all divisors of 20, the largest is (20), and among all multiples of 15, the smallest is (15).
1 1, there is a cube dice, and the numbers on six faces are 1, 2, 3, 4, 5 and 6 respectively. Throw it once
Dice, the possibility of getting an odd number is 1/2, and the possibility of getting an even number is 1/2.
Second, judge carefully. (5 points)
1, the equation must be an equation, but the equation is not necessarily an equation. ..................................................... (right)
2. False scores are all less than 1. ........................................................ (error)
3. Number pairs (4,3) and (3,4) indicate the same position. .................................... (error)
The greatest common factor of 4, 14 and 7 is 14. .............................................. (error)
5. Divide a wire into four sections, each section is meters. …………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
Third, choose carefully. (5 points)
1. A rectangular piece of paper with a length of 24 cm and a width of 18 cm should be divided into small squares with the same size, and there is no redundancy. The lowest can be divided into (a).
A. 12
2 is a true fraction, and the value of x has () possibilities. An incomplete theme
A.3 B. 4 C. 5 D. 6
3. There are 28 boys and 25 girls in Class 5 (3), and boys account for () of the class. 28/53 Incomplete problems
A.B. C. D。
4. Divide 4g into 5 parts, each part is (). An incomplete theme
A. Total weight
5. The greatest common factor of two numbers is 4 and the least common multiple is 24. These two numbers can't be (b).
A.4 and 24 B. 8 and 12 C. 8 and 24
Fourth, careful calculation (40%)
1, writing number 4%
6.3+7= 13.3
2 1.5+9.5= 3 1
2.5×0.4= 1
42.8-4.28= 38.52
1-0.0 1=0.99
3.5÷0.5=7
8.2÷0.0 1=820
8.2×0.0 1= 0.082
2. Solve the equation: 12%
X-7.4=8
x=8+7.4
x= 15.4
2X=3.6
x=3.6/2
x= 1.8
X÷ 1.8=3.6
x=3.6* 1.8
x=6.48
X+6.4= 14.4
x= 14.4-6.4
x=8
3. Find the greatest common factor and the least common multiple of the following groups. (9%)
10 and 9
The maximum common factor is 1 and the minimum common multiple is 90.
14 and 42
Maximum common factor 14, minimum common multiple 42.
Articles 26 and 39
Maximum common factor 13, minimum common multiple 78.
4. Recursive equation calculation: 9%
(2.44- 1.8)÷0.4=0.64 ÷0.4= 1.6
2.9× 1.4+2×0. 16 =4.06+0.32=4.38
30.8÷[ 14-(9.85+ 1.07)] =30.8÷( 14- 10.92)=30.8÷3.08= 10
5. Make an equation according to the meaning of the question and then answer it. (6 points)
① The sum of 7 x's is 10.5.
7x= 10.5
x = 10.5 \7
x= 1.5
Verb (abbreviation of verb) application questions: (1-3 questions, 27%, 5 points for each question, and 4 points for the rest).
1. There are 138 male athletes and 7 female athletes participating in the 28th Olympic Games in China, twice as many as male athletes. How many male and female athletes are there?
Male athletes 138, and 7 female athletes, which is twice less than that of male athletes. The number of female athletes is 138*2-7=276-7=269.
Male and female athletes * * 138+269 = 407.
In Beijing's bid to host the 2008 Olympic Games, * * has 65,438+005 valid tickets, and Beijing has 56 tickets. What percentage of valid votes did Beijing get?
The number of votes in Beijing accounts for 56105 = 56/105 = 8/15 of the valid votes.
Party A, Party B and Party C go to the library to borrow books. Party A comes every six days, Party B every eight days and Party C every nine days. If they meet in the library on April 25th, when will they all go to the library next time?
A comes every 6 days, B comes every 8 days and C comes every 9 days, so the least common multiple is 72.
If the three of them meet in the library on April 25th, they will meet again in July 10 72 days later.
There is a piece of cloth 8 meters long, just enough to make 12 pairs of pants of the same size. How many meters of fabric is used for each pair of trousers? How much of this cloth is used for each pair of trousers?
The fabric of each pair of trousers is 8÷ 12=8/ 12=2/3 meters, and the fabric of each pair of trousers is112.
5. Cut a rectangular piece of paper with a length of 20 cm and a width of 16 cm into squares with the same size and as large an area as possible. There is no paper. How many pieces can I cut at most?
The length is 20cm, the width is 16cm, and the greatest common factor is 4, so the side length of the square with the largest area is 4cm, and the area is 4 * 4 = 16cm2. The rectangular area is 20* 16=320 square centimeters.
You can cut 320÷ 16=20 pieces.