The Singing Hedgehog Guide to:
Prime Factors 7 - Fractions
If we know the prime factors of a number we can use them to simplify fractions quickly and easily.

    Example: Use prime factors to simplify 600 420
   
    We know from before that:
       
600 = 2 x 2 x 2 x 3 x 5 x 5, and
       
420 = 2 x 2 x 3 x 5 x 7, so we have:

        
2 x 2 x 2 x 3 x 5 x 5
           2 x 2 x 3 x 5 x 7

    cancelling gives:
        2 x 5
           7
which equals:
        13/7
    

Finding the HCF    Prime Factors     Making Squares

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