Using the divisibility tests, a number is divisible by 10 exactly when its last digit is which of these?
AThe digit 5
BThe digit 0
CThe digit 2
DAn even digit
Answer & Solution
Correct answer: B. The digit 0
1. The divisibility test for 10 checks only the final digit of the number.
2. A number is divisible by 10 if it ends with 0.
3. Ending in 5 makes a number divisible by 5 but not by 10, and an even last digit only guarantees divisibility by 2.
_Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 1 "Foundations", section 1.1 Introduction to Whole Numbers_
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