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Lesson 6: Divisors — Practice Questions

  1. 1. Since 7 divides both 28 and 63, the linear combination property states that 7 must also divide their sum. Their sum is ___.

  2. 2. The number 8 divides both 32 and 56. According to the property of linear combinations, which of the following numbers must also be divisible by 8?

    • A. 32 + 56
    • B. 56 / 32
    • C. 32 * 56
    • D. 56 - 30
  3. 3. If a number $k$ divides both integers $x$ and $y$, which of the following expressions is NOT guaranteed to be divisible by $k$ based on the property of linear combinations?

    • A. x + y
    • B. x - y
    • C. y - x
    • D. x + 1
  4. 4. We know that 4 divides both 16 and 28. The property of divisors states that 4 must also divide the difference $16 - 28$, which is ___.

  5. 5. It is known that 11 divides both 33 and 121. Which statement is a direct consequence of the linear combination property of divisors?

    • A. 11 must divide 121 - 33
    • B. 11 is a prime number
    • C. 11 must divide 121 * 33
    • D. Any multiple of 33 is divisible by 11
  6. 6. If 7 divides 21 and 21 divides 63, which conclusion is guaranteed by the transitivity property of divisors?

    • A. $63 \mid 7$
    • B. $7 \mid 63$
    • C. $7 \mid 21$
    • D. $3 \mid 7$
  7. 7. We know that 4 is a divisor of 20, and 20 is a divisor of 80. By the transitivity property, it must be true that 4 is a divisor of ___.

  8. 8. Which statement correctly demonstrates the transitivity property of divisors?

    • A. Since $6 \mid 12$ and $12 \mid 36$, then $6 \mid 36$.
    • B. Since $5 \mid 30$, then $30 = 5 \times 6$.
    • C. Since $3 \mid 15$ and $3 \mid 21$, then $3 \mid (15+21)$.
    • D. Since $10 = 2 \times 5$, then $2 \mid 10$ and $5 \mid 10$.
  9. 9. Let $m$, $n$, and $p$ be integers. If $m \mid n$ and $n \mid p$, then the transitivity property implies that $m \mid$ ___.

  10. 10. Given that $2 \mid 10$ and $10 \mid 50$, a student concludes that $2 \mid 50$. Is this conclusion a correct application of the transitivity property?

    • A. Yes, the conclusion is valid.
    • B. No, the conclusion is not valid.