# Adding a 1-Digit Number to a 2-Digit Number (by counting on)

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Common Core
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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

Now,

15 + 4 = 19

So, the sum of the given numbers is 19.

ds

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### Help

##### Remember :

The smallest number is the one that comes first while counting.

##### Solution :

To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.

21,27,23

21 is the smallest number.