Just 1
The two zeros are placeholders- placeholders are not significant
One - the trailing zeros are placeholders.
28 is 100(28/63) = 44 percent, to the justified number of significant digits.
192 digits
300
There are 2700 digits.
1100
425
The atomic weight of magnesium is 24.31; therefore, the number of moles in 100 gm is 100/24.31 = 4.11, to the justified number of significant digits.
Here are the first 100 digits in Pi.3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679Thank y'all for reading
100(2.58/58.45) = 4.41 %, to the justified number of significant digits.
100(6/21) = 28.5714286 %, ignoring any limitation on significant digits.
101