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Ee, The common factors are 2 and 3., , Step 3: Multiply the common fact, The HCF of 12 and 18 is 6,, , : = @x 6, Consider another example, that is, the HCF of 15 and 30, a6 8 3 \, The HCF of 15 and 30 =3x 5 ae, , ‘Ors to get the HCF. that is, 2 x 3=6, , =15., , , , __. the HCF of the following numbers using prime factorisation,, 1. 42and56 2. 48 and56 3. 18 and 45 4. 36 and 54, , 5. 21 and 35, 6. 120and 45 7 16 and 18 8. 108and130 9, 9and 15, , 10. 180 and 210, , Massa) 31-1, , , , ", , , , F of two or more numbers can also be found by using the pri, fisation method. Let us find the HCF of 8, 12 and 36., , 8 =AxAx2 ve, , , , , , , , , , The HCF of 8, 12 and 36 =, Thus, the HCF of 8, 12 and 3, , , , The HCF of 10, 30 and 45 = 5,, Thus, the HCF of 10, 30 and 4, , , , , an even be extended to more than three numbers., , islet ied, , , , ing numbers using the prime factorisation, , and 33 3. 32,60 and 80 4. 18, 45 and 36, ,75 and 90 7, 21,35 and 49 8. 48, 80 and 64, 418 and30 = 11. 17,68 and 34 12. 77,55 and 143