It is: 9.9 = 99/10 as an improper fraction
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Let x = 0.1515 100x = 15.1515 Subtract them. 99x = 15 x = 15/99
The multiples of 99 are infinite. They start with these and go on forever by continuously adding 99: 99, 198, 297, 396, 495, 594, 693 +99 . . .
The prime factors of 99 are 3,3 and 11 So: 32*11 = 99
198
1, 3, 9, 11, 33, 99.