Question
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  1. 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,
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.

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