It is: 1.01*105
1.01x105.
1.01 x 105.
1.01 x 10^5
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If the pont is a decimal point, then 1.01*102 If the point is a thousand separator, then 1,01*105 where the comma (,) stands for the decimal "point".
1.77 x 100 is already in scientific notation. The same figure is 1.77 in standard notation.
1.5 x 10-3 is already in scientific notation. The same figure is equal to 0.0015 in standard notation.
It is 7.6*10^1.
It is: 1.0*10-2
1.2312 x 10^1
1.227*109 km
Exactly as in the question but in scientific notation it is 2.189*105