1.239 rounded to 3 significant digits is 1.24
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6.36*10^2
There are three significant digits in 60.1.
It is 4730.
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.
Three. All nonzero digits are significant and zeros in between significant digits are always significant.