First, fill in. (30 points)

1, the decimal point becomes a percentage, just move the decimal point somewhere and add something behind it; To convert a percentage into a decimal, just remove something and move the decimal point to something.

2.37.25% read and 36% write.

3. 1 10 1% indicates the percentage and the decimal.

4. Uncle Wang planted 200 pear trees in his orchard and survived 190 pear trees. What is the survival rate of these pear trees? 3 ÷ 4 = what.

6. Thirty-five 0.0 1 is expressed in decimal, which is read as what is expressed in percentage and what is read.

7. The original price of a football is 60 yuan, and now it is sold in 54 yuan. What percentage of the original price is the current price?

8. Add a percent sign after 1 1.2, that is, whatever this number is.

9. After a 10% discount, the price of an electrical appliance is 450 yuan. What is the original price of this appliance?

10 and 70% of 400 grams is () grams; Six kilograms is the percentage of four kilograms.

1 1, what is expressed in decimals, what is expressed in fractions and what is expressed in percentages.

12, 4 is a percentage of 5, and 5 is a percentage of 4.

Second, the judgment (10)

1, a pile of coal used 70%, leaving 30% tons.

2. Master Wang processed 105 pieces, all of which were qualified, and the qualified rate was 100%.

3. Fractions whose denominator is 100 must be a percentage.

4. The percentage of molecules is sometimes greater than 100.

5. What percentage of the number A is the number B, that is, the number A is divided by the number B. ..

7. 10g sugar is dissolved in 10g water, accounting for 10% of sugar water.

8. A dress is sold at a 20% discount, that is, the current price is 20% off the original price.

9,35% is pronounced as 100% 35.

Three, solve the problem (24 points)

1, the original price of a color TV set is 4500 yuan, and now it is 15% off. How much cheaper is the current price than the original price? (4 points)

The number of boys in Class 2.6 (1) accounts for 20% of the class. What percentage of boys are less than girls? (5 points)

Shengli primary school had 25 volleyballs last year, and bought 5 new volleyballs this year. How many volleyball are there today? (5 points)

Xiaoming's family raised 4800 ducks last year, 20% more than last year. How many ducks have you raised this year? (5 points)

5. Li Yan read a story book. On the first day, she read 30% books. The next day, she read sixty pages. There are still 80 pages left. How many pages are there in this book? (5 points)