Hebei education printing plate sixth grade first volume mathematics unit 2 examination questions
First, fill in the blanks.
Before and after the ratio of 1. are multiplied or divided by the same number at the same time (except 0), and the ratio remains unchanged. This is called () ratio.
2. Two expressions with equal ratios are called ().
3. The two terms at both ends of a proportion are called proportion (), and the two terms in the middle are called proportion (). Product of two internal terms () Product of two external terms.
4.3∶9=3? ( )=( ); 30∶6=( )∶ 1= 15∶( )=
5. Write the proportion as required according to the picture on the right.
The aspect ratio is ();
The aspect ratio is ();
The ratio of length to circumference is ();
The ratio of width to circumference is ().
6. Write the proportion as required.
The ratio of (1) is 0.4, and I wrote ().
(2) The ratio is 1.5, and I wrote ().
7. Write the proportion as required.
The ratio of (1) is 3 and the ratio is ();
(2) The ratio is 2.5, and the ratio is ().
8. Write two groups of ratios with four numbers of 4, 6, 8, 12, namely () and ().
Second, multiple choice questions. (Put the serial number of the correct answer in brackets)
1. If 3/5 of A is equal to 5/3 of B (neither A nor B is 0), then A: B = ().
A. 1
2. For a cup of sugar water, the mass ratio of sugar to water is 1: 16. After drinking half, the mass ratio of sugar to water is ().
a . 1∶8 b . 1∶ 16 c . 1∶32
3. 15g salt is added to 300g water, and the ratio of salt to brine is ().
a . 1∶ 19 b . 1∶2 1 c . 1∶20
4. The following statement is true ().
A. Because 4: 5 = 4? 5=4/5, so ratio, division and score are the same meaning.
The division of any two numbers that are not equal to 0 can be written as the ratio of two numbers.
C.2/3 represents a number, not the ratio of two numbers.
5. The ratio of two specific energies in the following ().
A. 1: 2 and 4: 2 b.3: 5 and 9: 15
C. 1/2: 1/3 and 2: 3
Third, judge the question. (to the painting? , wrong painting? )
1. The formula consisting of two ratios is called proportion. ( )
2. The former term of the ratio is equivalent to dividend, the latter term is equivalent to divisor, and the ratio is equivalent to quotient. ( )
3. Because 3∶2=2/3, ratio and fraction have the same meaning. ( )
4. The basis of fractional reduction and simplified proportion is the same. ( )
5. If two ratios are equal, then these two ratios can definitely form a proportion. ( )
Fourth, calculation.
1. Change the following ratio into the simplest integer ratio.
64∶ 16 2.7∶0.36
2/3∶2/5 0.75∶3/8
2. Find the ratio.
7 .2∶0.24 12.6∶0.4
1/20∶ 1.2 4/7∶
3. Solution ratio.
25∶7 = x∶35 23∶x = 12∶ 14
Five, the following is the time and distance of the car at a certain speed.
Driving time (minutes) 3 5 10 14
Driving distance (km) 4.5 7.5 15 2 1
The ratio of driving distance to time
1. Write the ratio of driving time to distance and fill it in the table.
2. Write four groups of proportions according to the above results.
Sixth, solve the problem.
1. Weld a 30-decimeter-long aluminum strip into a rectangular frame. Make the length-width ratio of the mirror frame 3: 2.
(1) What is the length and width of this frame, in decimeters?
(2) What is the area of the picture frame?
2. An insecticide, which is prepared from medicinal powder and water in a ratio of 1: 250. Now there is powder 1.5 kg.
(1) How many kilograms of water can be added to make this pesticide?
(2) What is the quality of this pesticide?
3. The school distributes the purchased books to the fourth, fifth and sixth grades according to the ratio of 2: 3: 4. It is known that there are 56 books in grade six. How many books did the school buy?
4. A salt drying field can dry out 15 kg of salt with 500 kg of seawater. According to this calculation, how many tons of salt can be dried by 100 tons of seawater? (Use proportional solution)
5. The automobile transportation company wanted to transport 600 tons of relief materials to support the disaster-stricken areas, and eight vehicles transported these materials 1/4. According to this calculation, how many cars will be transported at a time for this batch of materials? (Use proportional solution)
6. Class A, Class B and Class C participate in tree planting activities. The ratio of trees planted in Class A and Class B is 3: 2, and that of Class B and Class C is 5: 2. What is the proportion of trees planted in Class A, Class B and Class C?
7. A workshop has 140 employees, which are divided into three production groups. It is known that the ratio of the first group to the second group is 2: 3, and the ratio of the second group to the third group is 4: 5. How many people are there in each of these three groups?
Hebei education printing plate sixth grade first volume mathematics unit 2 examination questions reference answer
I. 1. Basic attribute 2. proportion
3. External materials and internal materials are equal to
4.9 1/3 5 3 25
5.4∶3 3∶4 2∶7 3∶ 14
6. (The answer is not unique) (1) 2: 5 (2) 3: 2
7. (The answer is not unique)
( 1)6∶2= 12∶4 (2)5∶2= 10∶4
8. (The answer is not unique) 4∶6=8∶ 12 6∶ 12=4∶8.
Second, 1. C 2。 B 3。 B 4。 B 5。 B
Third, 1. 2.？ 3.？ 4.？ 5.？
4. 1.4: 1 15: 25: 32: 1.
2.30 63/2 1/24 1/2
3.x= 125 x= 16 1/6
Verb (abbreviation of verb) 1.3: 23: 23: 23: 2
2. (The answer is not unique)
4.5∶3=7.5∶5 5∶7.5= 10∶ 15
10∶ 15= 14∶2 1 3∶4.5= 14∶2 1
2.( 1) solution: suppose that x kilograms of water is added to make this pesticide.
1∶250= 1.5∶x x=375
(2)375+ 1.5=376.5 (kg)
3.56? 4? (2+3+4)= 126 (Ben)
4. Solution: Suppose X tons of salt is dried. 15∶500=x∶ 100 x=3
5. Solution: Suppose you need X cars.
8∶ 1/4=x∶ 1 x=32
6. Class A: Class B = 3: 2 = 15: 10
Class b: class c = 5: 2 = 10: 4.
A: B: C = 15: 10: 4.
Look at the "Hebei Education Press, the sixth grade, the first volume of the second unit of mathematics questions and answers" people also read:
1. Unit 4 Mathematics Test Paper of Grade Six
2. The sixth grade mathematics volume Unit 4 manuscript
3. The first volume of the sixth grade mathematics examination paper and the answers.
4. Answers to the first volume of the sixth grade mathematics examination paper