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Remember the related subtraction facts for doubles facts.

 1 + 1 = 2 2 – 1 = 1 6 + 6 = 12 12 – 6 = 6 2 + 2 = 4 4 – 2 = 2 7 + 7 = 14 14 – 7 = 7 3 + 3 = 6 6 – 3 = 3 8 + 8 = 16 16 – 8 = 8 4 + 4 = 8 8 – 4 = 4 9 + 9 = 18 18 – 9 = 9 5 + 5 = 10 10 – 5 = 5 10 + 10 = 20 20 – 10 = 10

Let's find difference of 18 and 9.

18 – 9 = ?

Consider the doubles fact:

9 + 9 = 18

Its related subtraction fact is:

18 – 9 = 9

So, the difference of 18 and 9 is 9.

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.