We can find the sum of a given one-digit and a two-digit number by counting on.
For example: Let's find the sum of 15 and 4.
In order to find the sum, we need to count up.
15 + 4 = ?
Let’s start counting from 15 and count up 4:
15, 16, 17, 18, 19
15 + 4 = 19
So, the sum of the given numbers is 19.
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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.