What is the rule of divisibility by 7?

glutynowy44

glutynowy44

Answered question

2022-07-12

What is the rule of divisibility by 7?

Answer & Explanation

Alexzander Bowman

Alexzander Bowman

Beginner2022-07-13Added 19 answers

Step 1
Starting from right mark off the digits in groups of threes (just as we do when we put commas in large numbers).
Now add up alternate group of numbers and find the difference between the two. If the difference is divisible by 7, entire number is divisible by 7.
For example 123456789113 , these are grouped as 123, 456, 789 and 113
and 123 + 789 = 912 and 456 + 113 = 569
As difference between 912 - 569 = 343
As 343 is divisible by 7, 123456789113 is divisible by 7

Do you have a similar question?

Recalculate according to your conditions!

Ask your question.
Get an expert answer.

Let our experts help you. Answer in as fast as 15 minutes.

Didn't find what you were looking for?