Free Practice Question
PS · Problem Solving
705-805
Divisibility/Multiples/Factors
The tens digit of is
Answer Choices
Correct answer marked belowA
1
3
Correct
C
5
D
7
E
9
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Explanation
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Official Explanation
Official
For tens digit, pattern recognition is very effective.
(Just multiply the last two digits since we only care about the tens digit)
…
(Just multiply the last two digits since we only care about the tens digit)
…
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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
705-805
Type
PS
Category