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                      Factorisation Method is used to find GCD or Greatest Common Divisor which is the largest
                      common number that divides the given two numbers.
                      Example: Consider the numbers 25 and 50.

                      Step  1    Write all the factors of 25- 1x25, 5x5. Thus, the factors of 25 are 1, 25 and 5.
                      Step  2      Now similarly write the factors of 50- 1x50, 2x25, 5x10. Thus, the factors of 50 are 1,
                                50, 2, 25, 5 and 10.
                      Step  3    Write the common factors of 25 and 50 from the first two steps. We have 1, 25 and 5.

                      Step  4    The highest number from Step 3 is 25. Therefore, 25 is the GCD of 25 and 50.
                      Now find the GCD of the following numbers:
                      a.  72 and 22          b.  69, 36 and 178







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