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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.

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โˆ™ 2010-07-02 12:54:29
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Q: What are the 20 divisibility test?
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