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.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.