1. Last year, the steel output of a steel plant was 107% of the original planned output, and the percentage written was (107%).
2. People often drink milk, but it says: "Fat 3.3%, protein 2.9% ..." These 3.3%, 2.9% and so on mean: ()
3. A project is completely completed, that is, (100)% of the task is completed.
4. After shifting the decimal point of a decimal to the left by one place, it is less than the original (90)%.
Xiao Ming's family saved 6% electricity in May than in April, so the electricity consumption in May was (94)% of that in April.
6.75 is 1 hour (125)%,
7.A number is 20, (1) is 20% less than B number, B number is (25), (2) is 20% more than B number, B number is (83.3333), (3)B number is 20% more than A number and B number is (24).
8. The speed of car A is faster than that of car B 15%, and the speed of car A is (1 15)% of that of car B,
9. Xiaoli has been in the bank in 200 yuan for one year, with an annual interest rate of 2.25%. After one year, Xiaoli can get (4.5) yuan of after-tax interest.
10 There are 48 students in one class today, and the attendance rate is 96%. There are (2) students absent from class.
1 1 A hotel had a turnover of 250,000 in September, leaving 237,500 after tax payment. This hotel pays taxes at the rate of 20%.
The choir of 12 has 32 girls and 18 boys. The number of boys is (56.25)% of the number of girls, and the number of girls accounts for (64)% of the chorus.
Second, multiple-choice questions,
1. Xiaohong did five math problems and made a mistake. The correct ratio should be (b).
a， 100%，B，80%，C，20%，
2. One quarter (b) of the number A is equal to 25% of the number B,
A, definitely b, maybe c, impossible,
3. Find out what 10% of a number is and take this number (c).
A, expand 10 times b, shrink 100 times c, shrink 10 times,
4. Cure rate of a certain disease (A)
A must be less than 100%, b must be greater than 100%, and c may be equal to 100%.
5. The ratio of A number to B number is 5:3, and B number is less than A number (C).
A, 20%, B, 25%, C, 40%
6. There are 7,200 trees planted in the forest farm, and the mortality rate of trees is 2%. How many trees survived? The formula is (c)
a，7200 × 2% B，7200 ÷ 2%，C，7200 × ( 1 - 2% ) D，7200 ÷ ( 1 - 2%)
After 30% of 7.4 tons of flour is sold, a quarter of it is sold, and * * * sells (c) tons.
a， 1.8 B， 1.45 C，2.55 D，2.2
8. Put 25g sugar into 100g water, and the sugar content of syrup is (a).
25% b 20% c one fifth d one quarter
True or false, (please fill in brackets, true or false,)
1. Divide the 5m-long rope into four sections, each section is 125% (each section is 125% m).
It's more cost-effective to get a 20% discount on a commodity than a 50% discount. (error)
3. Species 1 10 seedlings all survived, and the survival rate was 1 10% (wrong).
4. A washing machine raises the price by 5%, and then reduces the price by 5%. At this time, the price of each set is equal to the original, (wrong)
5. A commodity is sold after the price is reduced by 10%, which is 90% of the original price. (right)
6. Put 8g of drug into10kg of water, and the drug accounts for 0.8% of the drug. (error)
7.A is 25% more than B, and B is 25% less than A.. (error)
8. All the students of Grade 6 125 were present this year, and the attendance rate was 125% (wrong).
9. Add 10g salt to 10g water, and the salt accounts for 10% of the brine. (error)
10, seed germination experiment, 90 seeds germinated, 10 seeds did not germinate, the germination rate was 90%, (right)
Four, column calculation, (this topic needs a process, thank you,)
(1) 60% of a number plus 5 equals the number itself. What is the number?
1-60%= 40% of this number is equal to 5, so this number is 12.5.
(2) The sum of a number and one seventh is equal to 45% of four ninth. Find this number.
45% = 9 out of 20.
This number is equal to 4/9 times 9/20 minus 1/7.