Which number is​ greater?

9 x 10^-6
4 x 10 ^-5

You are welcome guys

It would actually be 4x10^-5 because that's closer to zero than 9x10^-6. Usually a good rule of thumb.

I think its 9x10^-6

9 x 10^-6 = 0.000009

4 x 10 ^-5 = 0.00004
soooo which is greater??

nope.

the larger the negative exponent, the smaller the number
4x10^-5 = 0.00004
9x10^-6 = 0.000009

Better review your exponents some more.

Ok, thanks oobleck and AJ L

9*10^-6 = 0.9*10^-5.

4*10^-5 > 0.9*10^-5.