Exclusive division rule for 7

Maths Tricks , short cut tricks for maths to make calculation easy and fast

Exclusive division rule for 7 Let me explain this rule by taking examples If you had 343, you would double the last digit to get six, and subtract that from 34 to get 28. If you get an answer divisible by 7 (including zero), then the original number is divisible by seven. If you don't know the new number's divisibility, you can apply the rule again: Example.
Example -:
623: 62 - (3 × 2) = 56 = 7 × 8
483: 48 − (3 × 2) = 42 = 7 × 6; Is this maths trick helpful? (8123) (2755) Post / Read comment (31)

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rangabhashyam (8 years ago)

for 539 and 616 how we can do

Like? Yes (100) | No (21)

ankur sharma (8 years ago)

is there any trick for more than three digits??

Like? Yes (47) | No (12)

prathipati.udayabhanu (8 years ago)

how can simplify 4-digit number?

Like? Yes (34) | No (6)

deek (8 years ago)

plz explain four and five digit no.

Like? Yes (19) | No (3)

shantanu singh (8 years ago)

its not working for 633 or 643

Like? Yes (23) | No (15)

unnam sai priya (8 years ago)

Its not working for 743 explanation: 74-(3*2)=74-6=68 68 is not divisibility of 7

Like? Yes (18) | No (33)

kalpana (8 years ago)

343: 34-(3*2)=28=7*4

Like? Yes (9) | No (2)

Nishit Gupta (8 years ago)

how to find that the given number is divisible by 7 if digit is more than three....example 6486 or 45289 is divided by 7 or not

Like? Yes (8) | No (4)

vivek Thakur (8 years ago)

How to check 647356 divisible by 7

Like? Yes (21) | No (3)

dev (8 years ago)

how to check for more than three digits...like 548674 ????

Like? Yes (13) | No

JANARTHANAN RAM (8 years ago)

Guys,I will explain user asked questions for your clear understanding.
It is cool, right?

Ex 1: 539
539=> 53-(9*2)=35
35 is divisible by 7.So that We can say 539 is divisible by 7. Fine?

Ex 2: 633
633=> 63-(3*2)=57
57 is not divisible by 7.So that We ca

Like? Yes (30) | No (3)

JANARTHANAN RAM (8 years ago)

Ex 3: 548674
548674=> 54867-(4*2)=54859
5485-(9*2)=5467
546-(7*2)=532
53-(2*2)=49
Yes I got 49 which divisible by 7,So 548674 is divisible by 7.
(Key:You can stop at 532 also ,If u know 532 is divisible by 7)

Like? Yes (37) | No (1)

JANARTHANAN RAM (8 years ago)

Ex 4: 6486
6486=> 648-(6*2)=636
63-(6*2)=51
Oops, 51 is not divisible by 7 right? So 6486 is not divisible.

Like? Yes (18) | No (2)

ARSHIN Shaik (8 years ago)

explain if it is divisible by other numbers?

Like? Yes (10) | No (2)

Ravi Prakash Dubey (8 years ago)

what for the other numbers in the units place example., 2401

Like? Yes (8) | No

Pranjal (7 years ago)

one more trick= take any no. ending with 5 in unit digit. for eg.35 now,multiply 5=5x5=25 and 3 with its greater no. 3x4=12 then the square of 35 will be 1225

Like? Yes (9) | No (1)

Ankita Vidyarthi (7 years ago)

wat abt 595??????????

Like? Yes (14) | No

praveen vaidya (7 years ago)

not getting explain properly

Like? Yes (6) | No

SHISHIR RANJAN (7 years ago)

the same rule is for 13,17 and 19 also. only we have to do is
in the case of 13 we have to multiply by 4 and added it to the remaining digit the result should be divisible by 13
same for 17 the unit digit have to multiply by 5 and sutracted it from the re

Like? Yes (7) | No (4)

deepika chinta (7 years ago)

yes
343:34-(3*2)=34-6=28=74
so,it is divisible by 7

Like? Yes (5) | No

rahul singh kushwaha (7 years ago)

what will we do if the given number is 4 digit or more?

Like? Yes (4) | No

Naresh Nani (7 years ago)

if it is a 5digit or 6digit number how to solve it

Like? Yes (1) | No

ramya (7 years ago)

34-(3*2)=28 .28 is divisable by 7 so 343 is exactly divisible by7

Like? Yes (1) | No

Alap Mistry (7 years ago)

This trick is only for three digits and last digit is less than 6 except some examples.

Like? Yes (1) | No

Biky (7 years ago)

what about 123? its not giving the result

Like? Yes (1) | No

Biky (7 years ago)

sorry 325?? its not giving proper ans

Like? Yes (1) | No (3)

k naresh kumar (7 years ago)

325 IS NOT DIVISIBLE BY 7

Like? Yes (1) | No

R CHANDRAPRAKASH (7 years ago)

what about the 4 digit numbers...?

Like? Yes (1) | No

abhishek anand (7 years ago)

how to divide if last digit isnot 3?

Like? Yes (4) | No

shilpa patel (7 years ago)

How that trick can apply for 4 digit number

Like? Yes (1) | No (1)

jigna upadhyaya (7 years ago)

Find wrong term in 3,4,10,32,136,685,4116

Like? Yes (1) | No

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Exclusive division rule for 7

Maths Tricks , short cut tricks for maths to make calculation easy and fast