Divisibility Test for 11 - Learn How to Check

  • Thread starter Thread starter irony of truth
  • Start date Start date
  • Tags Tags
    Divisibility Test
AI Thread Summary
To determine if a number is divisible by 11, alternate adding and subtracting its digits. For example, with the number 209, you would calculate 2 - 0 + 9, resulting in 11. If the final result is divisible by 11, then the original number is also divisible by 11. This method provides a straightforward way to check divisibility by 11. Understanding this rule can enhance your mathematical skills and help with larger calculations.
irony of truth
Messages
89
Reaction score
0
Hello

I would like to know how to determine whether a number is divisible by 11 or not... say 209.

I know the divisibility rules from 2 to 10... but how about 11?
 
Physics news on Phys.org
Add and subtract the digits alternately. The result is divisible by 11, if and only if the original number is.
 
Thread 'Minimum mass of a block'

Thread 'Minimum mass of a block'

Here we know that if block B is going to move up or just be at the verge of moving up ##Mg \sin \theta ## will act downwards and maximum static friction will act downwards ## \mu Mg \cos \theta ## Now what im confused by is how will we know " how quickly" block B reaches its maximum static friction value without any numbers, the suggested solution says that when block A is at its maximum extension, then block B will start to move up but with a certain set of values couldn't block A reach...
View full post »
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Divisibility Test: Determine if a Number is Divisible by 6, 8, 4
Replies
7
Views
1K
Proof: Palindromes Divisible by 11
Replies
1
Views
1K
Power Radiated From a Copper Cube
Replies
3
Views
825
How to correctly round in physics?
Replies
8
Views
2K
Help with elastic collisions please
Replies
12
Views
3K
How Long for a Beam of Light to Reach Earth?
Replies
21
Views
1K
How to solve this chain with Kirchhoff's laws?
Replies
18
Views
3K
I Testing Primality of 377 with Divisibility
Replies
7
Views
1K
MHB Tests of Divisibility- Simple tricks
Replies
11
Views
5K
Find the sum of all these electric currents
Replies
9
Views
1K

Hot Threads

Recent Insights

Back
Top