Question
- Find a common prime factor in each of these pairs of numbers.
Ask by Nguyen Li. in South Africa
Jan 23,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
- a) 3
- b) 11
- c) 7
Solution
To find a common prime factor for each pair of numbers, we’ll factorize each number into its prime components and identify the shared prime.
a) 21 and 411
Factorization:
- 21:
- 411:
- Sum of digits:
(divisible by 3) -
-
is a prime number. - So,
- Sum of digits:
Common Prime Factor: 3
b) 77 and 242
Factorization:
- 77:
- 242:
-
-
- So,
-
Common Prime Factor: 11
c) 56 and 63
Factorization:
- 56:
-
-
- So,
-
- 63:
-
-
- So,
-
Common Prime Factor: 7
Summary of Common Prime Factors:
- a) 3
- b) 11
- c) 7
Answered by UpStudy AI and reviewed by a Professional Tutor
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Extra Insights
To find a common prime factor for each pair, let’s break it down:
a) The prime factors of 21 are 3 and 7, while the prime factors of 411 (which is
) include 3. So, the common prime factor is 3.
b) The prime factors of 77 are 7 and 11, and the prime factors of 242 (which is
or
) include 11. Thus, the common prime factor is 11.
c) The prime factors of 56 are 2 and 7, and for 63, the prime factors are 3 and 7. Hence, the common prime factor is 7.
In summary:
- a) Common prime factor is 3.
- b) Common prime factor is 11.
- c) Common prime factor is 7.