Subtraction Input/Output Tables - Within 100

Subtraction is an operation that decreases a number after the operation.


For example: Consider the number 28.
If a number, say 6, is subtracted from it, then we get 22.
Here, 28 is decreased to 22 after the subtraction operation.
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Help

The correct answer is

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.