Significant figures and standard form

[aisham]

Hi, i have a doubt.
Write 105678 in standard form correct to:
1 significant figures
2 " "
3 " "
and 4 ""
i wrote 1s.f.= 1.05678×10^(5)
2) 10.5678×10^(4)
3) 105.678×10^(3)
4) 1056.78×10^(2)
Is it correct? Thankyou