0.72 in Scientific Notation = 7.2 x 10-1
Scientific notation is always written in the form a x10b. When b is positive, it shifts the decimal point to the right and when it is negative, the decimal point shifts to the left (when converting back to decimal form). See the link below for a full explanation.
To express 0.0247 in scientific notation properly you need to know the basic rules to convert. Shift the decimal point to the first no. greater than zero so 0.0247 becomes 002.47 hence the decimal has been crossed 2 digits which are 0 & 2, 002.47 is written as 2.47x10-2
note : the negative sign indicates that notation value is less than 1.
You need 1.22 x 10^-B.
B is number of places that decimal is moved to change 0.00000122 to 1.22. In this case, B is 6.
You thus have :
0.00000122 = 1.22 x 10^-6 <----------------------------
7.21 × 10-5
or
7.21E-5
It is: 9.2*10-7
1.22E-06
Jensnw