Elementary Mathematics • Topic Practice Hub
Number System (ADRE Questions & PYQ Solutions)
Practice official ADRE solved questions and previous year paper sets for Number System. Includes step-by-step solutions and explanations. Explore 6 questions collected from official SLRC ADRE Grade 3 & Grade 4 papers.
Total MCQs
6
Official PYQs
6
Subject
Elementary Mathematics
Format
Bilingual MCQs
Solved MCQs & Official Answer Explanations
ADRE 2024 • 2024 Paper 1Question 1
The sum of any two integers is:
A.always a non-zero positive integer.
B.always a non-zero negative integer.
C.always either a non-zero positive or a non-zero negative integer.
D.always either a non-zero positive, a non-zero negative integer or 0. ✓ (Correct)
Explanation: The closure property of integers under addition states that adding two integers always yields an integer, which can be positive, negative, or zero.
ADRE 2024 • 2024 Paper 1Question 2
What would be the middlemost digit in the smallest number that can be made using all the digits of 8936217?
A.3
B.6 ✓ (Correct)
C.7
D.9
Explanation: Arranging digits (1, 2, 3, 6, 7, 8, 9) in ascending order gives the smallest 7-digit number: 1236789. The middlemost (4th) digit is 6.
ADRE 2024 • 2024 Paper 2Question 3
The sum of the prime numbers between 1 and 20 is
A.77 ✓ (Correct)
B.81
C.85
D.89
Explanation: Prime numbers between 1 and 20 are 2, 3, 5, 7, 11, 13, 17, 19. Sum = $2+3+5+7+11+13+17+19 = 77$[cite: 3].
ADRE 2024 • 2024 Paper 3Question 4
The count of prime numbers between 80 and 100 is
A.2
B.5
C.3 ✓ (Correct)
D.4
Explanation: The prime numbers between 80 and 100 are 83, 89, and 97 (total of 3)[cite: 5, 6].
ADRE 2024 • 2024 Paper 3Question 5
In a range of consecutive numbers starting with 1, all the even numbers are removed. From the remaining, consider the first 7 numbers. The sum of these 7 numbers is
A.35
B.42
C.49 ✓ (Correct)
D.56
Explanation: First 7 odd numbers are 1, 3, 5, 7, 9, 11, 13. Sum $= 7^2 = 49$[cite: 5, 6].
ADRE 2024 • 2024 Paper 3Question 6
The difference between the smallest 3-digit even natural number and the largest 2-digit even natural number is
A.1
B.2 ✓ (Correct)
C.3
D.4
Explanation: Smallest 3-digit even natural number = 100. Largest 2-digit even natural number = 98. Difference $= 100 - 98 = 2$[cite: 5, 6].
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