Question

Which of the following equals 0.000001?
A.1 x 10^-5
B.1 x 10^-6
C.1 x 10^-7
D.1 x 10^-8

Answer 1

The best option is B. 1*10^-6.

Answer 2

Answer:  The correct option is (B) $1\times 10^{-6}.$

Step-by-step explanation:  We are to select the correct number from the options that is equal to 0.000001.

Option (A) is    

$1\times 10^{-5}.$

We have

$1\times 10^{-5}=\dfrac{1}{10^5}=\dfrac{1}{100000}=0.00001\neq 0.000001.$

So, this option is not correct.

Option (B) is    

$1\times 10^{-6}.$

We have

$1\times 10^{-6}=\dfrac{1}{10^7}=\dfrac{1}{1000000}=0.000001.$

So, this option is CORRECT.

Option (C) is    

$1\times 10^{-7}.$

We have

$1\times 10^{-7}=\dfrac{1}{10^7}=\dfrac{1}{10000000}=0.0000001\neq 0.000001.$

So, this option is not correct.

Option (D) is    

$1\times 10^{-8}.$

We have

$1\times 10^{-8}=\dfrac{1}{10^8}=\dfrac{1}{100000000}=0.00000001\neq 0.000001.$

So, this option is not correct.

Thus, the correct option is (B).