Riddle: I start with a line that never ends, yet no height can…

Riddle

i-can-be-long-or-short-yet-never-change-in-size-i

Riddle

i-am-a-number-small-and-neat-multiplied-with-myself-i

Riddle

i-am-the-sum-of-digits-that-always-gives-you-away-yet-i

Riddle

i-have-a-face-like-a-clock-but-numbers-i-lack-i-divide

Riddle

i-can-measure-weight-but-lack-a-scale-count-time