Question

what is the diviblibety rule of 7

Answer 1

Hey mate ,
:-) :-) How are you :-) :-)

Hers the happy answer to your question :-
As your question says that =
what is divisibility rule for 7

So your answer is

Step 1st = Take the last digit ans double it .

Step 2nd = subtract the result from the remaining digit .

Step 3rd = if the difference is divisible by 7 ,
then the original number is also divisible by 7 .

:-) :-) Hope it help's you :-) :-)
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Answer 2

hello mate here is yur answer




I really enjoy sharing the divisibility tests with students. Divisibility by 2 and 5 are probably the easiest. 4, 8, 16 are not too bad. 3 and 9 take some arithmetic, but not bad especially with a name like “casting out.” Divisibility by 6 takes two tests.

Divisibility by 7 is a strange thing to most students, and explaining why ir works requires some effort. But the algorithm (procedure) is quite simple.

(1) Drop the last digit.

(2) From this new (1-digit shorter) number, subtract two times the digit you dropped,

(3) If you now have a number that is either 0 or a number you know is divisible by 7, you are finished. The original number is divisible by 7. If you still need to do more, take the result from step (2) and go back to step (1).

Want a sample? Let’s test 439236.

Drop the 6. 43923 - 12 = 43911. Not yet.

Drop the 1. 4391 - 2 = 4389. Not yet.

Drop the 9. 438 - 18 = 420. I recognize this as a multiple of 7. But for those want to see it through.

Drop the 0. 42 - 0 = 42. Multiple of 7 for sure!! Once more with feeling.

Drop the 2. 4 - 4 = 0.

You did take out your calculator, didn’t you? 439236 divided by 7 is 62748.

7 is a crazy number. 1/7 is one wonderful repeating decimal.

I almost forgot divisibility by 11. Alternating sums !













Hope it may help u


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