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Estimate Differences

Consider the following options:

68 – 32

49 – 25

Let's identify the expression that has a difference nearly about 40.

Find the difference of each expression by rounding the numbers.
 

Let’s look at first option.
 

Round the numbers and then subtract.

 

 68 32 = ?
       
 70 30 = 40


The given expression has a difference of about 40.
 

Now, look at second option.

 

 49 25 = ?
 ↓      
 50 30 = 20


The given expression has a difference of about 20.

So, 68 – 32 has a difference nearly to 40.





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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.