Three significant digits.
502.65 to 3 significant figures is 503.
Yes - zeros in-between significant digits are significant.
One.
There are 10 millimetres in one centimetre. Therefore, 503 millimetres is equal to 503/10 = 50.3 centimetres.
Oh, dude, so like, 502.6548246 to 3 significant figures is 503. Because, you know, we're just rounding it off, making it look all fancy and stuff. Who even needs all those extra decimals anyway, right?
It has 4 significant digits but only one value.
503 kilos is 1,109 pounds.
503
The factors of 503 are: 1, 503.
503 knots is approximately 578 mph. The conversion factor is 1 knot = 1.15078 mph.
3. trailing zeros give scale but are not significant as values of accuracy
19.8031"