Need help on some scientific notation questions?

Question

so the direstions say carry out each of the following expressions using scientific notation.

so i have like 30 questions in my face but ill pick 3 of different variety so i know how to do them :D

so i picked 800/40000

and 400*.006*.002

and last one

.000035/ 700*.001

if anyone knows a link that shows how to do the scientific notation in different forms plz gimmi :D

Answer 1

800/40000

8*100 / 4*10000

8*10^2 / 4*10^4

(8/4)*(10^2/10^4)

2*10^(-2)

Remember that dividing two numbers that have the same base, is done by subtracting the exponents.

----------------------------------

400*.006*.002

4*100 * 6*.001*2*.001

4*10^2 * 6 * 10^(-3) * 2 * 10^(-3)

4*6*2*10^2 *  10^(-3)  * 10^(-3)

48 * 10^(-4)

--------------------------------------...

.000035/ 700*.001

3.5 *.00001 / (7*100)  * 1*.001

3.5 * 10^(-5) / (7*10^2) * 10^(-3)

3.5/7 * 10^(-5) * 10^(-2) * 10^(-3)

3.5/7 * 10^(-10)

1/2 * 10^(-10)

.5 * 10^(-10)

5.0 * 10^(-11)