3.2 x 10^8 = 320,000,000
6.205 x 10^8 is equal to 620,500,000.
8.02 x 10-8 is standard notation, sometimes called scientific notation (for 0.0000000802).
0.8
Your 106 is 10 x 10 x 10 x 10 x 10 x 10 = 1,000,000 If you have 10 to a given power, then it's 10 times itself that many times. The rule of thumb is that 10 to any power is a 1 followed by that many zeros. What that means is that if you have 103 you'll have a 1 followed by 3 zeros, or 1,000. In the case of 108 you'll have a 1 followed by 8 zeros, or 100,000,000.
4.03 times 10 to the power of 8 = 403,000,000
It is: 82-(2*8)+3 = 51
64.3 times 10 to the power of -8 in scientific notation is written as: 0.000000643
It is: (8*10^-3) divided by (5*10^-5) = 160
8.0 × 10-9 written in regular notation is: 0.0000000080
5.799*10-8
800
8 x 10-6
8 x 10-6 = 0.000008
8 x 106 = 8,000,000
51 divided by 8= 6.375 (or 6 and 3/8).
5 to the second power = 25 25 times -10 = -250-250 + -11 = -261-261*8 = -2088