These are the factor pairs of 1218:
1218,1
609,2
406,3
203,6
174,7
87,14
58,21
42,29
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2.2.3 and
2 is the greatest common factor because it is the largest factor that divides each number without a remainder.
The LCM is 12.
Write the factors of the first number in the left circle. Write the factors of the second number in the right circle. Write the numbers that are the same in each individual circle in the space where they intersect.
To find the common factor when factorising, look for any common factors that can be divided evenly from all the terms in the expression. Divide each term by this common factor, and then factorise the resulting expression further if possible. This will help simplify the expression and make it easier to work with.