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To test divisibility by 3, you add the digits and check the:
ASign
BSize
CSum
DSpan
Answer & Solution
Correct answer: C. Sum
1. The original number is set aside.
2. Its digits are added together.
3. If that sum divides by 3, so does the number.
_Source: OpenStax, Contemporary Mathematics, Ch 3 'Real Number Systems and Number Theory'_
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