The first 3 significant digits of a number are the first 3 digits starting from the left ignoring any leading zeros.
So 31456 = 31500 (3 significant digits)
The 5 in the "56" rounds the 4 up.
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1.239 rounded to 3 significant digits is 1.24
To round 233.356 to 2 significant figures, you first identify the first two non-zero digits from the left, which are 2 and 3. The digit after the second significant figure is 3. Since 3 is greater than 5, you round up the last significant figure. Therefore, rounding 233.356 to 2 significant figures gives you 230.
There are three significant digits in 60.1.
35164 is 35200 rounded to 3 significant figures. To round to 3 sig fig, use the 4th digit to decide whether to round up or down; digits after the first 3 are replaced by zeros: 4th digit is 6, so round up 35164 → 35200 to 3 sig fig.
Three. All nonzero digits are significant and zeros in between significant digits are always significant.