To test divisibility for 20, you need to use the tests for divisibility by 4 and 5.The test for divisibility by 4 is that the last 2 digits of the number, given as a 2-digit number, are divisible by 4.Example for 4:We are testing the number 11042.42/4 = 10.5 which is not a whole number. Therefore 11042 is not divisible by 4.The test for divisibility by 5 is that the last digit of the number is either 5 or 0.
If the number is also divisible by 2 and 3
A number is divisible by 6 if the number is divisible by 2 AND 3.
you can't
There is no easy rule for divisibility by 34.
Edward Chavez
No. If it is not divisible by 2 it cannot be divisible by 8, so don'y bother.
1, 2, 3, 5, 6, 10, 15, 30
There are two ways of answering this.Check the number for divisibility by 2.Check the quotient for divisibility by 2.Check the quotient for divisibility by 2.Check the quotient for divisibility by 2.Check the quotient for divisibility by 2.Check the quotient for divisibility by 2.For large numbers, the check can be restricted to the number formed by the last six digits.
Every number has a test for divisibility. The issue is that the tests get more complicated as the divisor increases. For primes up to 50, see either of the attached links.
It is not.
The divisibility rule for 2 works because the base of our number system, 10, is divisible by 2.