What is the rule for determining if a number is divisible by 7?
Practice Questions
1 question
Q1
What is the rule for determining if a number is divisible by 7?
The last digit must be 0
Double the last digit and subtract it from the rest of the number
The sum of the digits must be divisible by 7
The number must end in 7
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.
Questions & Step-by-step Solutions
1 item
Q
Q: What is the rule for determining if a number is divisible by 7?
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.
Steps: 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.
