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Show Your Class



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SHOW YOUR CLASS

 

 

Teacher - show your class the easy way to add and subtract fractions.

Use VERTICALLY AND CROSSWISE to write the answer straight down!

  •  

    Multiply crosswise and add to get the top of the answer:
    2 x 5 = 10 and 1 x 3 = 3. Then 10 + 3 = 13.
    The bottom of the fraction is just 3 x 5 = 15.
    You multiply the bottom numbers together.

    So:



  • Subtracting is just as easy: multiply crosswise as before, but then subtract:

 

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<p><img src="/images/Tutorials/FWF/Exercise.jpg" width="43" height="43" align="absmiddle"><span id="QHI_FWF_Show_Your_Class" class="QHC_TutorialButton">Show Your Class</span></p>

 

... nature is the
realisation of the
simplest conceivable
mathematical ideas
EINSTEIN