1.0093×10^5-9.98×10^4
Find result with correct significant figures
1.0093*10^5 - 9.98*10^4
= 100930 - 99800
= 1130
or,
1.0093×10^5 - 9.98×10^4
= 10.093×10^4 - 9.98×10^4
= 0.113×10^4
Now apply the rules about s.f.
Find result with correct significant figures
= 100930 - 99800
= 1130
or,
1.0093×10^5 - 9.98×10^4
= 10.093×10^4 - 9.98×10^4
= 0.113×10^4
Now apply the rules about s.f.