# Addition and Subtraction - Balance Equations - within 20

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Common Core
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Consider the equation:

12 + 2 = 17 – __

Let's identify the missing number that makes the equation true.

To identify the missing number, first we need to add 12 + 2:

12 + 2 = 17 – __

14 = 17 – __

Now, let’s look for the number which when subtracted from 17 gives 14.

14 = 17 – 3

12 + 2 = 17 – 3

So, the missing number is 3.

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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.