Answer :

To determine the HCF (Highest Common Factor) of 330 and 396 using prime factorization, we can follow these steps:

1. Prime Factorization of 330:
- Start with the smallest prime number, 2. Since 330 is even, it's divisible by 2:
[tex]\[ 330 ÷ 2 = 165 \][/tex]
- Now, try the next smallest prime number, 3. Since the sum of the digits of 165 is 12, which is divisible by 3, 165 is divisible by 3:
[tex]\[ 165 ÷ 3 = 55 \][/tex]
- Move to the next prime number, 5. Since 55 ends with a 5, it is divisible by 5:
[tex]\[ 55 ÷ 5 = 11 \][/tex]
- Finally, 11 is a prime number.
- Therefore, the prime factors of 330 are: [tex]\[ 2, 3, 5, 11 \][/tex]

2. Prime Factorization of 396:
- Start with 2 again, since 396 is even:
[tex]\[ 396 ÷ 2 = 198 \][/tex]
- Divide by 2 again, since 198 is also even:
[tex]\[ 198 ÷ 2 = 99 \][/tex]
- Try 3, since the sum of the digits of 99 is 18, divisible by 3:
[tex]\[ 99 ÷ 3 = 33 \][/tex]
- Divide by 3 once more, as 33 is also divisible by 3:
[tex]\[ 33 ÷ 3 = 11 \][/tex]
- Finally, 11 is a prime number.
- Therefore, the prime factors of 396 are: [tex]\[ 2, 2, 3, 3, 11 \][/tex]

3. Identify the Common Prime Factors:
- The common prime factors between 330 and 396 are: [tex]\( 2, 3, \)[/tex] and [tex]\( 11 \)[/tex].

4. Calculate the HCF:
- For each common factor, take the smallest power that appears in the factorization of both numbers.
- For 2, the smallest power is [tex]\( 2^1 \)[/tex].
- For 3, the smallest power is [tex]\( 3^1 \)[/tex].
- For 11, the smallest power is [tex]\( 11^1 \)[/tex].

- Multiply these smallest powers together to get the HCF:
[tex]\[ HCF = 2^1 \times 3^1 \times 11^1 = 2 \times 3 \times 11 = 66 \][/tex]

Therefore, the HCF of 330 and 396 is 66.

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Rewritten by : Jeany