I do not understand why there are two decimal places. But either ways if you are asking for : 0.0000489 then it is 4.89*10⁻⁵ 0.489 then it is 4.89*10⁻¹ The trick is to count the zeroes to the first actual significant number you see and then write the number you counted with a negative sign for your power. I hope this helps!
