Odd and even numbers Knowledge-Based Download PDF

Questions

1. 1.

   A whole number has an odd digit in its tens place and an even digit in its ones place. Which of the following statements about this number must be true?

   • A) The number is always odd because its tens digit is odd.
   • B) The number is always even because its ones digit is even.
   • C) The number can be odd or even depending on the hundreds digit.
   • D) The number is always odd because adding an odd digit and an even digit gives an odd sum.
2. 2.

   Which of the following statements is always true for any two odd numbers?

   • A) Their sum is always an even number.
   • B) Their sum is always an odd number.
   • C) Their product is always an even number.
   • D) Their difference is always an odd number.
3. 3.

   If $n$ is any even number, which of the following expressions always results in an odd number?

   • A) $n + 4$
   • B) $3n$
   • C) $2n + 5$
   • D) $n^2$