Mathematics is a spirit, a rational spirit. It is this spirit that inspires, promotes, inspires and drives human thinking to the most perfect degree, and it is this spirit that tries to decisively influence human material, moral and social life. The following is a decimal handwritten newspaper of fourth-grade mathematics compiled by me. Welcome to read the reference!
The fourth grade elementary school mathematics examination questions volume one
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1. Draw a circle with a diameter of 15cm with a compass, and the distance between the two legs of the compass is ().
2.25m is 20% less than (), and 40kg is 20% more than ().
3. The number that is 50% more than 30 is (), and the number that is 50% less than 30 is ().
4, a 200-page book, read 20%, and the remaining () pages are unread.
5. 40% of the number A is equal to 50% of the number B, and the number A is the number B ().
6. The turnover of a hotel in May was 265,000 yuan, and the business tax was paid at 3% of the turnover, and the taxable amount was () yuan.
7. 75% of a number is 150, and 20% of this number is ().
8. A circle has a radius of 6 cm, a circumference of () cm and an area of () cm2.
9.A number is 50% of B number, and B number is ()% of A number.
10. Draw the largest circle in a rectangle with a length of 8 decimeters and a width of 4 decimeters. The area of this circle is () square decimeter.
1 1. Add 40 kilograms of salt to 200 kilograms of water, and the salt content of salt water is ().
12, where a number is 10 and b number is 8, (10-8)÷8=25% means ().
13, Uncle Liu bought 6,000 yuan of national construction bonds with a fixed term of three years and an annual interest rate of 2.89%. Uncle Liu intends to donate the interest to Project Hope, and he can donate () yuan.
Second, judgment.
1, the number A is 30% more than the number B, and the number B is 30% less than the number A ... ()
2. Increasing production by 28% means increasing production by 28%. ( )
3. Interest is the interest rate. ( )
The circumference of a circle is always more than 3 times its diameter. ( )
A discount of 5.5% means that the current price is 6.5% of the original price. ( )
Third, solve the equation
x+40% x = 770 40% x-20% x = 7.8 x+20% x = 6.6 1-25% x = 0.75
Fourth, solve the problem.
1. The outer diameter of the bicycle wheel is about 75cm. If the average speed is 10 turns per minute, how long will it take to cross a bridge with a length of 586.75 meters?
2. Shopping malls offer discounts in different seasons, and all cotton-padded clothes are 15% off. Discounted price of a cotton-padded coat 170 yuan. How much was the original coat?
Li Ming deposited 2500 yuan in the bank last February 1 with a maturity of 2 years and an annual interest rate of 2.79%. How much principal and interest can he get back when it expires?
4, a pencil box after 20% price reduction in 36 yuan. How much has the price of this pencil box been reduced?
Nine students in Class One, Grade Six have a table tennis match. If every two students have a game, how many games will there be? (Draw a picture and count it)
6. A laptop is sold at a 20% increase. Later, due to market reasons, it was sold at a 15% discount. After the price reduction, the price of each computer is 5 100 yuan. Is this computer profitable or losing money? How much did you make or lose?
Fifth, the problem of brain exercise time.
1. Suppose a planet has only six hours a day and 36 minutes an hour. What is the acute angle formed by the hour hand and the minute hand at 3: 00 18?
A scientist designed a strange clock. This clock has only 10 hours every day and night, and 100 minutes every hour. When the strange clock shows 7: 75, what time is it actually?
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