1. Rewrite the following "into a number" into a percentage.

Fifty percent (), seventy percent (), thirty-five percent () and one hundred percent ().

2. Rewrite the following percentages as "into numbers"

30%( ) 45%( ) 10%( ) 95%( )

3.30 kg is 50 kg (%), and 50 kg is 30 kg (%).

4.5 tons less than 8 tons (%), 8 tons more than 5 tons (%).

5.540 meters is 20% of () meters.

6.()25% of the hectares are 20 hectares.

Second, the judgment question. (Draw "√" on the right and "×" on the wrong)

1. The ratio of interest to principal is called interest rate. ( )

This year, the output of a piece of land increased by 25% compared with last year, that is, by 10%.

It's two five. ( )

3. A liquid medicine, the ratio of water to medicine is 1: 20, and water accounts for 5% of the liquid medicine. ( )

( )

Third, multiple choice questions. (Put the serial number of the correct answer in brackets)

1. Half a percentage point is ()

50%

B.0.5%

Five percent

The native wheat in a plot is 25 tons, which was reduced by 20% last year because of the flood and increased by 20% this year. So this year's output and the proportion of producing areas ()

A. Increased

B. Reduced

C. No change

Xiaoying deposited 1000 yuan in the bank with an annual interest rate of 2.45%. Calculate the principal and interest she should get after two years, and the formula should be ()

A. 1000×2.45%×2

B.( 1000×2.45%+ 1000)×2

c . 1000×2.45%×2+ 1000

Fourth, the calculation problem

1488+ 1068÷89

4.2÷ 1.5-0.36

Fifth, the application problem.

1. A wheat experimental field produced 24.5 tons of wheat last year, an increase of 20% this year. How many tons of wheat does this experimental field produce this year?

A plot of land produced 65,438+02 tons of rice last year, which was 25% less than the previous year due to the flood. How many tons of rice did this land produce every year before?

Li Ying deposited RMB 5,000 in the bank 1 year, with an annual interest rate of 2.25%. How much interest should Mars get when it matures?

4. Walter WANG deposited RMB 10000 in the bank for a fixed period of 3 years, with an annual interest rate of 2.7%. When due, how much principal and interest should Wang Gang get?

In a cotton field, 30 tons of lint was harvested last year, 5 tons more than the previous year. How much has lint yield increased in this cotton field?

6. In a farm, there are 20% fewer ducks than chickens, and more chickens are raised than ducks 1000. How many ducks are raised on this farm?