10/7 is a rational number. Its decimal representation results in a repeating decimal, but, as I pointed out earlier, *all rational numbers have decimal representations that result in repeating decimals. Often that repeating decimal is …00000… and is, by convention, ignored. Thus, when we are representing 1/8 we normally represent it as 0.125 and not by 0.125000… 10/7 is a uniquely defined point on the number line and you can go there directly without the need of successive approximations of the sort needed for an irrational number such as pi or the square root of two.
Yes, it is sufficient to say that 10/7=1.428571… Note that the 1 to the left of the decimal point and the one at the end of the repeating section to the right of the decimal point are independent of each other; 17/7=2.428571…
Also note that if there is a nonrepeating portion of the decimal expansion (as in 11/6=1.8333…) or if the repeating decimal is one digit long (as in 4/3=1.333…) it is considered good form to repeat the repeating portion two or three times to establish what the repeating sequence is.
