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641 millionths is rational because it can be written as a ratio of two integers, 641:1000000. This means that 641 millionths is equal to 641/1000000, which is a rational number.

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Q: How do you that 641 millionths is rational by writing it as a ratio of two integers?

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641 millionths is 641 divided by one miilion. That is, 641/1,000,000

The ratio of integers to rational numbers is 0.

a ratio of integers

Not quite. A rational number is a ratio and each rational number is a ratio of specific pairs of integers - not ANY two integers. And, of course, 0 is not allowed on the denominator.

Any number that can be expressed as the ratio of two integers is a rational number.

NO it is not irrational, that is to say it IS rational. If you can write a number as ratio of integers, it is rational. -11.7 can certainly be written as a ratio of integers.

A rational number is one which can be expressed as a ratio of two integers.

It is a rational number.

No. It is a ratio of TWO - not ONE - integers.

Yes. But if you have a ratio of two integers, the ratio will be rational by definition.

A rational number is defined as a number that can be expressed as a ratio of two integers. A ratio of two integers is also known as a fraction.

Any 2 digit integers are rational numbers because all integers or whole numbers are rational numbers.