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There are essentially three forms:

- Terminating decimals: 386 or 23.567,
- Recurring decimals: 36.572343434... (with 34 repeating),
- Non-terminating infinite decimals: these represent Irrational Numbers for which the digits after the decimal point go on for ever without falling into a repeating pattern.

Q: How many forms can you write a decimal number?

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Write a decimal point, and then write three zeros after it.Now, anything you write after the three zeros, no matter how many digits andno matter how large or small they are, forms a number written as a decimal thatis less than one thousandth.There are an infinite number of them. Here are three:0.00010.00097625940.00000000000008

There are many ways to write it. Here's one: 170.00000You can write as many zeros as you want after the decimal point.

4 is a whole number and can never be a decimal.

At least five. If you want to, you can write a decimal point at the end of the number, and then add as many zeroes as you want after the decimal point. They won't change the value of the number.

On digit (not didgit!).

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Write a decimal point, and then write three zeros after it.Now, anything you write after the three zeros, no matter how many digits andno matter how large or small they are, forms a number written as a decimal thatis less than one thousandth.There are an infinite number of them. Here are three:0.00010.00097625940.00000000000008

There are many ways to write it. Here's one: 170.00000You can write as many zeros as you want after the decimal point.

An infinite number.

None. If you move the decimal point you will change the value of the number!

As many as you can write.

4 is a whole number and can never be a decimal.

At least five. If you want to, you can write a decimal point at the end of the number, and then add as many zeroes as you want after the decimal point. They won't change the value of the number.

You write the decimal in the numerator, WITHOUT the decimal point. In the denominator, you write a "1", followed by as many zeros as there are digits after the decimal point in the original number. Finally, simplify the fraction if it can be simplified.For example: to convert 2.15 into a fraction, you write this as 215/100, then simplify.

On digit (not didgit!).

To convert just the decimal portion of a number, write the digits after the decimal point as the numerator over the line. Now for the denominator, write a 1 followed by as many zeros as the number of digits you wrote in the numerator. For example if the decimal was 0.070549, then the fraction would be 070549/1000000 = 70549/1000000

just take the number after the decimal and put it over a denominator. you know how many zeros the bottom place needs depending on how far away the number is from the decimal. the number in front of the decimal becomes the mixed number.1 = 1/101.11 = 1 1/11.7777 = 7777/10000 see the numbers end 4 places away, so the bottom will have 4 zeros.

A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the required decimal representation is 12, exactly as in the question.