How to turn decimals into fractions. For example, 2 5 5 2. Find the algorithm!

You can set the denominator to be x equal to 1

Then =x is incremented until it's not a decimal place.

The way to determine if it is a decimal: multiply it by two, and then divide it by two to see if it is equal to the original number, if so, then it is not a decimal.

The way to turn a decimal into a fraction is:

1. The integer part of the decimal is equal to the integer part of the fraction.

2. For the pure decimal part of the decimal number, divide the number after the decimal point by the reciprocal of the front spike unit of the last number, and then divide it.

For example: 234/1000 = 117/500.

If the decimal is a decimal, the number of the decimal part is the numerator, 10 is the denominator, and then the fraction is restricted.

If there are two decimal places, the number of the decimal part is the numerator, 100 is the denominator, and then the fraction is enough.

If there are three decimal places, the number of the decimal part is the numerator, 1000 is the denominator, and then the fraction is enough.

First, multiply and divide the original number by the same number (10 or 100 or 1000...).and so on), so that there is no decimal point for each number, and then simplify it.

For example: character string to integer function:

Set the current character index to 0 and the previous number to 0

Subtract the current character 0 from the current character to get the current number.

The current index is equal to the length of the string minus the end of the loop.

Previous number = previous number multiplied by 10 plus current number.

Split strings with a decimal point as a separator.

String two strings of words into integers.

The decimal part divided by 10 to the power of the length of the decimal string minus one.

You can add two numbers if you want.

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The method of decimal into fraction is:

1. To see how many decimal places there are, add a few 0s to the end of 1 as the denominator;

2. Remove the decimal point from the original decimal to make the numerator;

3. The offer points that can be reduced to the simplest score are turned into the simplest scores.

For example, the method is to treat the decimal as a special fraction with a denominator of "1", and then expand the numerator and denominator of the fraction by a multiple of the number of decimal places at the same time, and then see if it can be further simplified.

1. To see how many decimal places it is, add a few 0s to the end of 1 as the denominator;

2. Remove the decimal point from the original decimal point and make the numerator;

3. The offer points that can be contracted.

For example: three decimal places - add 3 0s after 1 as the denominator (that is, 1000) - silver cloth - remove the decimal point to make the numerator (that is, 125).

The score is 125 out of 1,000 – about 1 out of 8

After the decimal is converted into an integer, it is divided by the multiple of the rent, and in the general case, it is multiplied by a multiple of 10, and then simplified. For example, it can be turned into 11.

Explanation in two steps: (1) When the integer part is "0", it is a decimal place, which is a few tenths, two decimal places are hundredths, and three decimal places are thousandths of ......Finally, it is divided into the simplest fractions. Example: If the integer part is not "0", add zero to the integer part.

Let the original number be s, and then multiply by the corresponding multiple, so that the original number is reduced to an integer. Then convert the formula to get the corresponding score Lao Xiang, and simplification can refer to combustion. Such as:

s= 1000s=1375 s=1375/1000=11/8 s= 100s=605 s=605/100=121/20

Divide the numerator by the denominator, and this applies to both true and false fractions. If it is a fraction like the example problem, you need to turn the fraction into a false fraction first, the denominator remains the same, the numerator is the product of the integer part multiplied by the denominator plus the sum of the original numerator, that is, the numerator = 2 * 8 + 5 = 2 Hugong Gao Jia Huang Huang Arm Withering for 1, and then divide the numerator by the denominator: 21 8=;

The decimal is converted into a fraction, in the case problem, it is 1 part, multiply the numerator and denominator by 1000, which is 7375 out of 1000, and then the method is the same as the first question.

Look at how many decimal places there are in a number, add a few 0 denominators after 1, and remove the decimal point from the original number as the numerator, which can be reduced to the offer point. Another example.

The way to turn a decimal into a fraction is:

1. The integer part of the decimal is equal to the integer part of the fraction.

2. For the pure decimal part of the decimal number, divide the number after the decimal point by the reciprocal of the unit of the last number, and then divide it.

For example: 234/1000 = 117/500.

For example: 2/5 = 12/5

Or that's the kind of algorithm.

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The fraction is reduced to a decimal, and the numerator is used as the dividend and the denominator is used as the divisor to calculate the quotient, such as: 2 4