You did 3) wrong. Using your method..
3)6.5x10^-3 - 3.5x10^-9
0.006 5-0.000 000 003 5=0.0059999965
5.9999965 x 10^-3
Let me show you an easier way. Convert both numbers to the same power.
6.5E-3 - 3.5E-9
6.5E-3 - 3.5E-3E-6
(6.5- .000 0035 )E-3
6.499 99965 E-3
5.2x10^6 + 3x10^5
55E5 or 5.5E6
what does E stand for?
E means x 10^ It is often used in computers, calculators, and in ASCII chat as here. It is easier.
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