0
If it is even, divide it by two. If your second number is also even, your original number is divisible by four. This is a necessary and sufficient condition; A cannot be divisible by four if either of {A, B} is odd.
If either your original number or your second number were odd, then the original number is not divisible by four.
Proof of this rule (by cases):
Where applicable, A = 2B.
- A even, B even: B = 2m (m is a whole factor of B) and therefore A = 4m, therefore 4 is a factor of A by definition of a factor.
- A even, B odd: if B is odd, it does not have 2 as a whole factor. Therefore there exists no whole m such that A = 4m, and therefore 4 is not a factor of A by definition of a factor.
- A odd: A cannot have any even factors. 4 is even. Therefore 4 is not a factor of A.
Still curious? Ask our experts.
Chat with our AI personalities
Taiga
Rafa
ViviAdd your answer:
Earn +20 pts
Is seventy four in the four tables?
No. The number 74 is not divisible by 4. One trick is to add the digits of the number and see if it is divisible by four. this trick applies only to the number 4 7+4= 11 11 is not divisible by 4.
Is 736 divisible by 4?
Yes. Here's a trick, take the last two digits (36) and if it's divisible by 4 then 736 is divisible by 4.
Is 524 divisibility by 3?
no.. heres a trick: if you add together the numbers (5+2+4) and that answer equals a number that is divisible by 3 then the number is divisible by three 5+2+4=11 11 is not divisible by 3 therefore, 524 is not divisible by 3
How many three digit numbers are divisible by 4?
Trick question all numbers are divisible by four ,but only 175 result in whole numbered answers
Is 247 divisible by 2 3 5 9 or 10?
Not two ( the number is not even )Not five or ten ( dosent end with zero or five )Not nine ( Trick: 2+4+7=15 ) Not divisible by nineYes Three: 15 is divisible by threeNote: the trick only works with three and nine
