0.0195. Note that leading zeros are non-significant.
There are five significant digits.
All three numbers are significant digits, so 3.
12,300 has 3 significant figures.
3.
31500
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.
0.0195. Note that leading zeros are non-significant.
Simply cut off the extra digits: 5.00
To round numbers to 3 significant figures, identify the first three non-zero digits from the left. If the digit after the third significant figure is 5 or more, round up the last significant figure. If the digit after the third significant figure is less than 5, keep the last significant figure the same. Trailing zeroes can be kept to maintain the significant figures.
3 significant digits.
No, it has 3 significant digits.
It has 3 significant digits.
You can just round it off. For example, if your number is 8.38572998472654400131... that is equal to approximately 8.4 (if two significant digits is enough for your purposes) or 8.39 (if you prefer 3 significant digits).
When multiplying numbers with different numbers of significant digits, the result should have the same number of significant digits as the least precise measurement. Count the number of significant digits in each number, perform the multiplication as usual, and then round the result to the least number of significant digits used in the calculation.
000203 has 3 significant digits.
There are 3 significant digits in 20.0