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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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FOR THE TEACHER
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