Free Practice Question
PS · Problem Solving
sub-505
Divisibility/Multiples/Factors
What is the smallest positive integer that must be added to 645,732 to ensure it is divisible by 9?
Answer Choices
Correct answer marked belowA
1
B
3
C
5
9
Correct
E
11
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Explanation
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Official Explanation
Official
To determine the smallest positive integer to add to 645,732 for divisibility by 9, we first calculate the sum of its digits: 6 + 4 + 5 + 7 + 3 + 2 = 27. Since 27 is already divisible by 9, we need to add 0 to keep it divisible. However, since we are looking for a positive integer, we…
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Comments
2
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A
AmanSep 26, 2024
Tricky wording but good practice
Z
ZuzannaJul 10, 2024
Can someone explain it other way?
What this question tests
What it tests
Your understanding of divisibility rules, least common multiples, and greatest common factors.
Common trap
Forgetting that 1 is not prime and that every integer divides 0.
Details
Difficulty
sub-505
Type
PS
Category