Subtracting money is same as subtracting numbers.
For example: Let's find the difference of $46 and $13.
First, subtract the ones.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.