Calculating a product and quotient in scientific notation

[camboguy]

calculating SCIENTIFIC NOTATION by hand help please.

((4*10^5)(5*10^-7)) / (2*10^-3)


im getting 10 and the answer but its should be 100 can you please tell me what i am so posted to do step by step please.

 

[Dick]

4*5/2=10. Doing the exponents 5+(-7)-(-3)=1. So 10*10^1=10*10=100.

 

[TheoMcCloskey]

If that is indeed the problem as stated, then

Mantissa:

(4 * 5) / 2 = 20 / 2 = 10

Exponents:

5 - 7 -(-3) = 8 - 7 = 1

Answer = 10 * 10^1 = 10 * 10 = 100 = 1 * 10^2

Do you see?

 

[camboguy]

thanks you very much