Yes
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Yes. A rational number is one that can be expressed as a ration of two whole numbers. 0.171717 is 171717/1000000 or the ration of 171717 to 1000000 [ the word rational has the same linguistic root as ratio].
"Is it rational" is the same as asking "can it be made into a fraction?" 1.020304 = 1020304 / 1000000 Yes. ■
Any number with a defined end point is rational. In this instance, 0.363636 is equal to 363636/1000000 or three hundred and sixty-three thousand six hundred and thirty-six millionths.
0.424242 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in rational form, is 424242/1000000. You can simplify this rational fraction if required.
500000+500000=1000000 400000+600000=1000000 700000+300000=1000000 200000+800000=1000000 900000+100000=1000000