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Fractions

Division

Imagine for a moment we have some leftover pie, amounting to 5/12 of a pie and we want to find how many 1/8-sized pieces can be cut from the leftovers. We could calculate this amount by dividing 5/12 by 1/8.

5 over 12 ÷ 1 over 8 = 3 and one third3 and one third3 and one thirdone third of an eighth

5/12 ÷ 1/8 = 5/12 × 8/1 = 40/12 = 3 1/3

To divide a number by a fraction, we multiply the number by the reciprocal of the fraction:

x divided by c/d=x times d/c and when that number is a fraction, a over b divided by c over d equals a over b times d over c

Example

Click on the question marks to see the division step-by-step.

5 divided by 2/3 = 5 times 3/2 = (5*3)/2 = 15/2

5/7 divided by 2/3 = 5/7 times 3/2 = (5*3)/(7*2)=15/14

4/3 divided by 5/7 = 4/3 times 7/5 = 4/3 times 7/5 = 28/15

 

More Examples

 

Here are some more examples of dividing two fractions:

         

    ÷    
    =   
    ×    
    =   
    =   
         

Exercise

Practice by dividing the following fractions:

       

Working space

 

Answer

     

    ÷    
    =   
    =   
     

Division of signed fractions

Just as for all operations, the same basic methods apply to signed fractions. The only extra complication is that we must remember to deal with the sign. Decide the sign first before you divide so you don't forget.

Signs of numbers after division

÷

+

+

+

+

Examples

7 eighths divided by negative 1 half equals negative 7 over 4

negative 1 quarter divided by 2 thirds equals negative 3 eighths

negative 3 fifths divided by negative nine tenths equals 2 thirds

Exercise

Now try some exercises. Remember to reduce the fractions if possible.

       

Working space

 

Answer

     

   ÷    
   =   
   =   
     

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