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Add and Subtract Fractions with Related Denominators

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To add (or subtract) unlike fractions, first change them to fractions with same denominator. Then, add (or subtract) the numerators and put the result over the common denominator.

 

For example: Let’s add the fractions
1 2
and
1 4
.

Notice that the denominators of both the fractions are not the same.

 

So, let’s change them to fractions with same denominator.

 

Find the equivalent fraction of
1 2
having denominator 4.
 
1
2
=
1 × 2
2 × 2
=
2
4

 


Now, add the fractions. Add the numerators and put the obtained result over the common denominator.

 

 

1
2
+
1
4
=
2
4
+
1
4
                 =
2 + 1
4
                 =
3
4

 

 

So,
1
2
+
1
4
=
3
4
.





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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.