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Which of the following is a necessary condition for a number to be divisible by

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Question: Which of the following is a necessary condition for a number to be divisible by 7?

Options:

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

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

Solution: 

To check for divisibility 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 also divisible by 7.

Which of the following is a necessary condition for a number to be divisible by

Practice Questions

Q1
Which of the following is a necessary condition for a number to be divisible by 7?
  1. The last digit must be 0
  2. The number must be even
  3. Double the last digit and subtract it from the rest of the number
  4. The sum of the digits must be divisible by 7

Questions & Step-by-Step Solutions

Which of the following is a necessary condition for a number to be 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 you found in Step 2.
  • Step 4: Subtract the result from Step 3 from the rest of the number (the number without the last digit).
  • Step 5: Check if the result from Step 4 is divisible by 7. You can do this by dividing it by 7 and seeing if there is a remainder.
  • Step 6: If the result from Step 4 is divisible by 7, then the original number is also divisible by 7.
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