Is 9th pi a fraction? Are all circular decimals rational? Are irrational numbers infinite decimals?

Is 9th pi a fraction? Are all circular decimals rational? Are irrational numbers infinite decimals?

π Is an irrational number, so 9th of π is an irrational number, not a fraction.
All cyclic decimals can be reduced to fractions, rational numbers.
All infinite non-circulating decimals are irrational and can not be turned into fractions

Fill in the blank: If four rational numbers are multiplied and the product is negative, then the number of negative factors is ______.

Abcd <0,
1 Or 3 negative numbers in a, b, c, d,
Therefore, the answer is:1 or 3.