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Friday, December 21, 2012

Jaizen's Fraction Scribepost


How to divide fractions using multiplication,

First step: put the fraction question top to bottom like this,

Wrong way: 1    .    1
                     -    --   -
                     4    .    3
Correct way1
                       4
                       1
                       3
 Second Step: you have to flip 1 into 3  then multiply 1 with 3
                                                 3        1                         4         1
Example: 1    3
                4 x 1
                1    3
                3 x 1

 Third Step: multiply 1 with 3 and 4 with 1 and the answer will become 3
             4
Example: 1    3    3

                4 x 1 = 4

                1    3

                3 x 1
 If you don't understand here some questions from page 70 on the home work booklet.
 7a) 5  .  2
       -  --  -
       8  .  3
Answer: 
              5    3    15
              8 x 2 = 16
              2    3
              3 x 2
7b) 7   .     2
          -- 4 3
           .
Answer: 
              7      3      21        7
              1   x 14 = 14 or 114
              14     3
               3  x 14
7c)  5    .   7
     1-  -- -
       6    .  12 
Answer: 
              11   12    132            6
              6  x 7  =  42   or   3 42
              7     12
              12 x 7

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