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1. Which of the following is a one-digit number?
A. 10
B. 9
C. 23
D. 100
2. What is the smallest two-digit number?
A. 10
B. 11
C. 12
D. 9
3. What is the largest three-digit number?
A. 100
B. 999
C. 1000
D. 900
4. A supercell is a number that is greater than:
A. The number to its right only
B. The number to its left only
C. All its adjacent numbers
D. The smallest number in the table
6. How many supercells are there in the table below? 5346, 1258, 9635
A. 1
B. 2
C. 3
D. 0
7. Which of the following numbers lies between 5000 and 6000?
A. 4500
B. 5250
C. 6750
D. 7000
8. What is the midpoint of 1000 and 2000 on a number line?
A. 1250
B. 1500
C. 1750
D. 2500
9. Which of these numbers comes first on the number line?
A. 2180
B. 2754
C. 1500
D. 3600
10. A number that reads the same backward and forward is called a:
A. Symmetric number
B. Palindrome
C. Even number
D. Repeating number
11. Which of these numbers is a palindrome?
A. 121
B. 234
C. 567
D. 879
12. The palindrome formed by reversing and adding 68 is:
A. 144
B. 1111
C. 232
D. 324
13. The Kaprekar constant for four-digit numbers is:
A. 1234
B. 6174
C. 3412
D. 9472
14. In Kaprekar’s process, what do you do after finding the difference between the largest and smallest numbers formed by a 4-digit number's digits?
A. Add the numbers
B. Multiply the numbers
C. Subtract the numbers again
D. Repeat the process with the result
15. Which number completes the sequence: 12, 6, 3, 10, 5, __?
A. 12
B. 8
C. 16
D. 9
16. Which number in the sequence 3, 10, 5, 16, __ is a power of 2?
A. 5
B. 10
C. 16
D. 3
17. A two-digit number that is divisible by both 2 and 5 is:
A. 10
B. 15
C. 20
D. 25
18. The Collatz sequence starting at 12 reaches the number 1 after how many steps?
A. 5
B. 9
C. 10
D. 7
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