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Estimate Sums

Consider the following options:

48 + 47

12 + 49

74 + 24

28 + 51

Let's identify the expression that has a sum nearly about 80.

Find the sum of each expression by rounding the addends.
 

Let’s look at first option.
 

Round the addends to the nearest tens and then add.

 

 48 + 47 = ?
     
 50 + 50 = 100

 

This expression has a sum nearly equal to 100.
 

Now, look at second option.
 

 12 + 49 = ?
     
 10 + 50 = 60


This expression has a sum nearly equal to 60.
 

Now, look at third option.
 

 74 + 24 = ?
     
 70 + 20 = 90


This expression has a sum nearly equal to 90.
 

Now let’s look at the last option.
 

 28 + 51 = ?
     
 30 + 50 = 80


This expression has a sum nearly equal to 80.
 

So, 28 + 51 has a sum nearly to 80.





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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.