# Subtraction Input/Output Tables - within 20

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We know that subtraction is the operation that decreases a number after the operation.

For example: Consider the table given below:

 In Out 14 11 19 16 13 10 15 12

Let's find the rule from the table given.

Notice that the given rule makes each number decrease.

Try subtracting 3 from each number.

14 – 3 = 11

19 3 = 16

13 3 = 10

15 3 = 12

Here, on subtracting 3 from the ‘Input’ numbers, we get the ‘output’ numbers.

So, the rule is subtract 3.

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.