Thread: 900 to 1, 2, or 3 significant figures?

Hi, can anyone explain to me why 900 (or any similar numbers) can be given as one, two or three significant figures? I don't get it.

900 may be written in scientific notation as

Also 900 to three sig figs is 900. <--A decimal point, not a period.

-Dan

PS Also, to 1 fig we have 9 x 10^2
For 2 fig we have 9.0 x 10^2
For 3 fig we have 9.00 x 10^2

Also the 90 x 10^1 has only has 1 sig fig