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What is the rule for determining if a number is divisible by 7?

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Question: What is the rule for determining if a number is divisible by 7?

Options:

  1. The last digit must be 0
  2. Double the last digit and subtract it from the rest of the number
  3. The sum of the digits must be divisible by 7
  4. The number must end in 7

Correct Answer: Double the last digit and subtract it from the rest of the number

Solution: 

To check if a number is divisible by 7, you can double the last digit and subtract it from the rest of the number; if the result is divisible by 7, then the original number is as well.

What is the rule for determining if a number is divisible by 7?

Practice Questions

Q1
What is the rule for determining if a number is divisible by 7?
  1. The last digit must be 0
  2. Double the last digit and subtract it from the rest of the number
  3. The sum of the digits must be divisible by 7
  4. The number must end in 7

Questions & Step-by-Step Solutions

What is the rule for determining if a number is divisible by 7?
  • Step 1: Take the number you want to check for divisibility by 7.
  • Step 2: Look at the last digit of that number.
  • Step 3: Double the last digit.
  • Step 4: Remove the last digit from the original number to get the rest of the number.
  • Step 5: Subtract the doubled last digit from the rest of the number.
  • Step 6: Check if the result from Step 5 is divisible by 7.
  • Step 7: If the result is divisible by 7, then the original number is also divisible by 7.
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