3
The 1 and the 2
To one significant digit, 37.19 is 4x101. Writing it as 40 makes it unclear as to whether you have 1 significant digit or 2.
Three of them which are 1, 0 and 2
Just the one and it is the digit 1
3
The 1 and the 2
To one significant digit, 37.19 is 4x101. Writing it as 40 makes it unclear as to whether you have 1 significant digit or 2.
They all have 1 as the first digit.
Three of them which are 1, 0 and 2
Just the one and it is the digit 1
Well, in science you always need significant digits: 0 has no significant digits, so we round to the nearest number with 1 significant digit: namely, -1 or 1.
When the last digit of a significant digit is 5, you always round up.
There is one significant figure in 0.00001, which is the non-zero digit 1.
4 All of them are significant. Only zeros are potentially insignificant. And that's only when your numbers either start with zeros like 0.001 (1 significant digit 1) or end with zeros 13.0000 (2 significant digit, 13). Any zeros between non-zero numbers are significant.
300 only has one significant digit.
All digits are significant in this case. Any digit after a decimal point is a significant digit.