Set the decimal in the form p/q, where p and q are integers.
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0.1 is equivalent to 1/10 which is a rational number
No. It is a rational number. Any repeating decimal or terminating decimal is rational.
Decimals are real. They can be rational or irrational.
A number with a finite number of decimal digits is always rational. (If the number of decimal digits is infinite, the number is rational only if there is a repeating pattern.)
It is still a rational number.