No, the sum of an odd number of odd numbers is always odd. Therefore, it is impossible for five odd numbers to sum to 30. | Card: 2 / 20 |
Fill in the blank: Parity refers to the property of a number being either ___ or ___. | Card: 3 / 20 |
Fill in the blank: The sum of two odd numbers is ___ because it can be arranged in pairs. | Card: 7 / 20 |
True or False: The sum of any three consecutive odd numbers is always divisible by 3. | Card: 9 / 20 |
Let the numbers be (2n–1), (2n+1), (2n+3). Their sum is 6n + 3, which is divisible by 3. | Card: 10 / 20 |
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The sum of three numbers is 45. Two of them are even and one is odd. What is the parity (odd/even) of the total sum? | Card: 11 / 20 |
True or False: A 3×3 magic square can have repeated numbers and still be called a magic square. | Card: 13 / 20 |
I’m part of a square with equal row, column, and diagonal sums. I’m neither the biggest nor smallest, but without me, it’s not magic. I live in the middle. Who am I? | Card: 15 / 20 |






