Ten More or Ten Less than a Number

To find 10 more than a number, add 1 to the digit at the tens place.

To find 10 less than a number, subtract 1 from the digit at the tens place.

For example: Let's find 10 less than the number 47.

This number can be written in the place value table as:

 

Tens Ones
4 7


Notice that there are four tens in the number 47.
 

Tens Ones
4
7


To find 10 less than 47, subtract 1 from the digit at its tens place.

4 – 1 = 3

Tens Ones
3 7

 

So, 10 less than the number 47 is 37.





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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.