Subtracting One-digit Numbers from Numbers upto Two Digits

Let's find the difference of 10 and 5.

10 – 5 = ?

Count back from the bigger number.

 

Let’s start from 10 and count back 5:

 

10, 9, 8, 7, 6, 5
 

Now,
 

10 – 5 = 5
 

So, the difference of 10 and 5 is 5.
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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.