Significant digits refer to the number of digits that are known versus the number of digits that are estimated. So if the number 20 is an approximation, there is only one significant digit, which is the 2. However, if 20 is accurate to the ones place, then there are 2 significant digits. 20.00 has four significant digits, because it is known that the number is accurate down to the hundredths place.
Two. The decimal indicates that the zero is significant otherwise it wouldn't be a significant digit.
310+205 of 310=310+ 20/100*310=310+62=372
62 is 20 percent of 310.
0.20 X 75.00 = 15, to the justified number of significant digits.
Potassium has a gram atomic mass of 39.1, to three significant digits (one more significant digit than "20 meq" has). Therefore, one meq = 39.1 mg, and 20 meq = 20(39.1) = 7.8 X 102 mg, to the justified number of significant digits.
3.14159265358979323846 are the first 20 digits of pi.
The proposition is false. From 1 to 99, the digit 0 is NOT repeated 20 times!