Six answers to the math unit 1 percentage practice questions

Solution: (1) (1) (1-40 50) * 100% = 20% = 1 52) Let A and B be separated by x, then the speed of Ming Ming and Jun Jun is x 40, x 50 respectively, so x 50 x 40 = 4 5 = 80%, then Jun Jun's speed is 80% faster than Ming Ming's speed

3) (1-20%)*20=16 tons.

3) 240 * (1 + 20%) = 2.88 million.

4) Solution: If one kilogram of apples is x yuan, then one kilogram of pear (x + yuan, then the equation can be listed as, solution x = 3, then the ** of pear is 3 + yuan.

5) 24 (1-4%) = 25 people.

6) If there are x boys and x people, then the girls are x(1+15%)=x+3 people, and if the equation is solved x=5 people, then the girls are 8 people.

7) 12 * 20 * (1-10%) = 2.16 million.

8) 1780 * (1-20%) = 1424 yuan.

9) 17850 (1-15%) = 21000 yuan.

10) 7920 (1+10%)=7200 yuan.

11) 50000*(1+RMB.)

12) 60,000 + 60,000 * yuan.

1.Obviously it takes 20% less time than Junjun, and Junjun is 25% slower than Mingming. 2.

16 tons of water were used in October. 3.The plan is to use 3 million.

4.One kilogram of pears is 3 yuan, and one kilogram of apples is yuan. 5.

There are 50 female students. 6.There are 20 boys and 23 girls.

7.The actual turnover was 2.16 million yuan. 8.

Mr. Wang actually received a manuscript fee of 1,584 yuan. 9.The pre-tax income of the hotel is 21,000 yuan.

10.The price of the motorcycle is 7200 yuan. 11.

You can get back 50,900 yuan. 12.After expiration, you can get back 78,750 yuan.

The focus of this unit is on the percentage, which refers to the percentage of the reference after the word "than", such as the first question, which is a few percent less than Junjun, and the less is a percentage of Junjun, and in the second question, it becomes how many percent is faster than Mingming, and it becomes a percentage of Mingming's reference. Figure this out, and all the problems will be solved. If you don't get this ratio wrong, you won't be wrong with the answer.

1. Fill in the blanks:

1) The meaning of 5 7 8 is ( ).

The meaning of 5 7 1 8 is ( ).

2) Storybooks are more than science books 3 5, 3 5 is to regard ( ) as the unit "1", and storybooks are science and technology books ( The relation is (

3) April is 1 7 less than May, 1 7 is regarded as the unit "1", April is May, and the equivalent relationship is ( ).

4) A barrel of oil weighs 7 4 kg, pour out 1 6 kg, and there are ( ) kg left. Columnar ( ).

A barrel of oil weighs 7 4 kg, pour out 1 6, and there are ( ) kg left. Columnar ( ).

5) Knowing that a 7 3 = 11 12 b = 11 11 c, and a, b, and c are not equal to 0, the three numbers a, b, and c are arranged in order from small to large as ( ).

6) A pile of goods, the first time transported half of the total, the second time was transported half of the first time, this pile of goods is left ( ) has not been transported.

6) After transferring the people from the 51st class out of 1 7 to the 52nd class, the number of people in the two classes is equal, and the original number of the 52nd class is the 51st class ().

7) For a section of the road, the first week repairs the total length of 2 5, the second week repairs the first week 2 5, and the second week repairs the full length.

8) Produce a batch of parts, complete 3 8 of the total in the morning, complete the remaining 2 5 in the afternoon, and complete the total ( ) in the afternoon

2. Use a horizontal line to draw the amount of unit "1" in the question, and then complete the relation.

1) The number of hens is more than the number of roosters1 4

2) The current price of color TV is 1 7 lower than the original price.

3. Choice. (14 points).

1.The radius of a circle multiplied by is equal to this circle (

1) Half of the circumference and (3) The circumference of the semicircle.

2.Draw the largest one inside a rectangle 6 cm long and 4 cm wide'circle, the area of this circle is square centimeters (

1) The radius of the circle (2) The diameter of the circle (3) The area of the circle.

4.The radius of a circle is 1 decimeter, and the circumference of its semicircle is centimeters. (

5.The diameter of a circle is enlarged by a factor of 6, and its area is (

1) 6 times larger, (2) 36 times larger, (3) 12 times larger.

6.The area of the shaded part of the three figures below is larger. (

1) Figure (1) Large (2) Figure (2) Large (3) Figure (3) Large (4) Equally large.

First, write the number directly.

2. Think about it and fill it in.

The 2 3 is ( ) The number of A is 3 4 is 240, and the number A is ( ).

2. Rewrite 2 71 4=1 14 to the division equation is ( ).

3. Fill in or =

2 has ( ) 1 10 in it; 3 of 2 3 is ( ) tons.

5. The simplest integer ratio is ( ) and the ratio is ( ).

8. The ratio of a ratio is 2 3, if the previous term of this ratio is 10, then the latter term is ( ).

9. The number of girls is 3 5 of the number of boys, and the ratio of the number of girls to the number of boys is ( ) The number of boys in the class is ( ).

10. Fill in the appropriate score 250 kg = ( ton 3 4 = ( min.

3. Please be a little referee.

1. When two fractions are divided, the quotient must be greater than the dividend. (

2. Simplifying 15 5 results in 5. (

3. Divide the 1 2 meters of iron wire into 4 sections equally, each section is 1 meter long. (

centimeter 20 m = 520 = 1 4 (

Fourth, choose carefully. (Insert the serial number of the correct answer in parentheses).

1. A is 1 4 of b, and b is ( ) of a

a, 4 times b1 4, c, 3 4

2. B's 7 11 is equivalent to A, and ( ) should be regarded as unit 1.

a, a b, b c, cannot be determined.

grams of salt are put into 100 grams of water, and the ratio of salt to brine is ( ).

a、1∶100 b、100∶1 c、1∶101

4. From home to school, my sister uses 8 points and my sister uses 9 points. The ratio of the distance traveled by the elder sister to the younger sister per minute is ( ).

a、8∶9 b、9∶8 c、8∶17

5. The first and second terms of the simplest ratio must be ( ).

a, prime number b, odd number c, coprime number.

6. What is the number'1 6 is 2 9, find this number. The correct equation is ( ).

a、1/62/9 b、2/91/6 c、1/62/9

5. Calculation questions.

1. Calculate the following questions.

2 258 25 (7 8+13 16)13 16 (1-3 5)x=1 10 (solution equation).

2. Simplify the ratio first, and then find the ratio.

24 8 1 12 5 24 3 kg 800 g.

3. 2 times a number is 5 8 less than 3 4, find this number. (Solved with equations) [.]

6. Solve problems.

1. A pair of Apple brand jeans is 128 yuan, which is 4 5 of a jacket, how much is a jacket?

2. There are 450 pear trees in the orchard, and the apricot trees are 3 5 of the pear trees and 6 7 of the peach trees, how many peach trees are there in the orchard?

3. The school divides 350 books to class A and B in the ratio of 3 2, how many books does class A get?

4. Li Ming's family raises 35 chickens, and the ducks raised are 5 fewer than the chickens, and the number of ducks accounts for a fraction of the chickens?