Decimal fractions, fractions, fractions, and ratios of all knowledge Urgent!!!!!!!!!!!!

To convert a decimal into a percentage, simply move the decimal point to the right by two places and add a percent sign after it; To convert percentages to decimals, simply remove the percent sign and shift the decimal point two places to the left. The fraction is converted into a percentage, and the numerator and denominator are decimals, as long as the decimal point is moved to the right by two places, and the percent sign is added after it; The fraction is divided into decimals, and the numerator and denominator are decimals;

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Search for "all fractionalized fractions in elementary school mathematics".

1. They are all decimals: look at the number of decimal places of the previous and last terms, use the basic properties of the ratio, and at the same time expand the specialization into integers, and then divide them by their greatest common factor at the same time.

2. They are all fractions: the least common multiple of the same multiplication denominator to get the integer ratio, and if they are not cogeneous, they must be divided by their greatest common factor.

3. The ratio of fractions and integers is first multiplied by the denominator of fractions to become integer ratios, and then divided by their greatest common factor.

4. Fractions and decimals: You can convert decimals into fractions, and then use the method of fractions to simplify.

You can convert decimals into fractions, call it simpler, and then use the ratio sign as a division sign for calculation, for example.

2/5 = 3 5:2 5 = 3 5 2 5 = 3:2

than to see as divided.

Divide by 2/5 = multiply by 5/2 and then divide the result =

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The difference between a percentage and a fraction.

1 percent has a very different meaning than a fraction. A percentage is "a number that indicates that one number is a hundredth of another number." "It can only represent a multiple relationship between two numbers, not a specific quantity.

For example, it can be said that 1 meter is 20% of 5 meters, but it cannot be said that "a length of rope is 20% meters." Therefore, the percentage cannot be followed by the name of the unit.

Scores can have specific names. The fraction is "the number of such parts or parts that are divided equally into parts of unit '1'". A fraction can also represent a multiplier relationship between two numbers.

2 The range of application is different. Percentages are often used in surveys, statistics, analysis and comparison in production, work and life. Fractions are often used in measurements and calculations when no integer results are available.

3 Different forms of writing. Percentages are usually not written as fractions, but are represented by a percent sign "%". Such as:

Forty-five percent, writing: 45%; The denominator of the percentage is fixed at 100, so no matter how many common divisors there are between the numerator and denominator of the percentage, it is not divided; The numerator of the percentage can be either a natural number or a decimals. The numerator of a fraction can only be a natural number, and its representation is as follows:

True fractions, false fractions, and band fractions, and those whose calculation results are not the simplest fractions are generally differentiated into the simplest fractions by approximation, and those that are false fractions are turned into band fractions. Any percentage can be written as a fraction with a denominator of 100, and a fraction with a denominator of 100 does not always have the meaning of a percentage.

(1) Any fraction with a denominator of 5, just multiply the numerator by 2 and shift the decimal point one place to the left (10 times smaller).

For example, 13 5 = 13 2 10 = 26 10 = (2) 17 20 = 17 5 100 = numerator multiplied by 5 divided by 100 (3) 7 25 = 7 4 100 = numerator multiplied by 4 divided by 100), (4) 67 50 = 67 2 100 = numerator multiplied by 2 divided by 100), (5) 171 125 = 171 8 1000 = numerator multiplied by 8 divided by 1000).

5 6 = is an infinite loop, add a dot to the head of 3 to indicate it) 5 8=, 17 25=, 2 9= is an infinite loop, add a dot on the head) 3 5=, 3 4=, 4 15= is an infinite loop, add a dot on the head) 7 10=

A number is a hundredth of another number, which is called a percentage, and a percentage is also called a percentage or percentage. Percentages are usually not written as fractions, but are followed by "%" after the original numerator, for example:

90 100 writes 90 percent and reads 90 percent. For example: 1

The number A is 30 percent more than the number B, and the number A is what percentage of the number B? 1+30%=130% 2.Oranges are 15 percent less than apples, and what percent are oranges the size of apples?

1-15%=85% 3.Class Five (1) has 30 boys and 25 girls. What percentage more boys than girls?

30-25) 25=20% What percentage of the class are boys? 30 (30+25)=approx.) What percentage of the class are girls? 25 (30+25) = approx.)

100% converted to 190% converted to a number.