What is the ratio of the smallest two digit number to the smallest four digit number?

The correct option is C 1 : 100
Smallest two digit number = 10
Smallest four digit number = 1000

Ratio of the smallest two digit number to the smallest four digit number

= 10 : 1000

= $\frac{10}{1000}$

= $\frac{1}{100}$

= 1 : 100