Divisibility Rule for 20
If you divide a number by 20 and you get a whole number as an answer (quotient), then that number is divisible by 20.
Instead of simply dividing your number by 20 to see if you get a whole number, you can use what we call the Divisibility Rule for 20.
The Divisibility Rule for 20 is used to determine if a number is divisible by 20. You can also call it the test of divisibility for 20.
A number is divisible by 20 if the tens digit is an even number AND the ones digit is 0.
For example, 246,260 is divisible by 20 because the tens digit (6) is even and the ones digit is 0.
However, 246,269 is not divisible by 20 because although the tens digit (6) is even, the ones digit (9) is not a 0.
Remember, both conditions must be met for the number to be divisible by 20.