# Adding Three One-Digit Numbers (Sums up to 20)

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Common Core
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To add three numbers, group any two numbers and find their sum. Then, add the third number to the sum obtained.

For example: Let’s calculate 1 + 2 + 4.

First, group 1 and 2 and find their sum.

1 + 2 + 4 = (1 + 2) + 4 = 3 + 4

Now, add the third number to the sum obtained.

3 + 4 = 7

So, 1 + 2 + 4 = 7.

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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.