Which number stays unchanged when its digits reverse?
440
400
404
044
Trivia for Kids 8–14 · Mixed
Number Detective Agency
Ten fresh questions for ages 8–14 exploring number detective agency. Mixed difficulty with explanations and host verification notes in the import file.
A locker number reads 507. Replacing the zero with 3 increases it by…
300
3
30
3000
A whole number's digits sum to 18. It must be divisible by…
11
9
5
7
Which belongs outside the prime-number club?
23
21
29
31
A prime number greater than 2 cannot be even because…
It would also be divisible by 2
Prime numbers must end in 1
Every even number ends in 2
Even numbers have no factors
A number squared ends in 6. Which last digit could the original have?
3
7
9
4
True or false: The sum of two odd whole numbers is even.
True
False
Which expression preserves 8 × 17 by splitting 17?
8 + 10 × 7
8 × 10 + 7
8 × 10 × 7
8 × 10 + 8 × 7
How many trailing zeros does 10! have?
3
5
2
1
A positive integer has exactly three positive divisors. It must be…
The square of a prime
Any odd number
The cube of a prime
Any multiple of three