How do I make 1972.8 into two significant digits? You would have to go up to the next thousand (since it's above 1950), but you get up to 2000 as the next highest number, but that only has one sig fig. Thanks!
One way is shown above. If you want to write the number without a decimal point, then here is what Wikipedia has to say.So, here it would be 2000 to 2 s.f.The significance of trailing zeros in a number not containing a decimal point can be ambiguous. For example, it may not always be clear if a number like 1300 is accurate to the nearest unit (and just happens coincidentally to be an exact multiple of a hundred) or if it is only shown to the nearest hundred due to rounding or uncertainty... These conventions are not universally used, and it is often necessary to determine from context whether such trailing zeros are intended to be significant. If all else fails, the level of rounding can be specified explicitly. The abbreviation s.f. is sometimes used, for example "20 000 to 2 s.f." or "20 000 (2 sf)".