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Which of the following is a rule for determining if a number is divisible by 3?

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Question: Which of the following is a rule for determining if a number is divisible by 3?

Options:

  1. The last digit is 0
  2. The sum of the digits is divisible by 3
  3. The number is even
  4. The number ends in 3

Correct Answer: The sum of the digits is divisible by 3

Solution: 

A number is divisible by 3 if the sum of its digits is divisible by 3.

Which of the following is a rule for determining if a number is divisible by 3?

Practice Questions

Q1
Which of the following is a rule for determining if a number is divisible by 3?
  1. The last digit is 0
  2. The sum of the digits is divisible by 3
  3. The number is even
  4. The number ends in 3

Questions & Step-by-Step Solutions

Which of the following is a rule for determining if a number is divisible by 3?
  • Step 1: Take the number you want to check for divisibility by 3.
  • Step 2: Break the number down into its individual digits.
  • Step 3: Add all the digits together to get a sum.
  • Step 4: Check if the sum you calculated is divisible by 3 (this means it can be divided by 3 without leaving a remainder).
  • Step 5: If the sum is divisible by 3, then the original number is also divisible by 3.
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