Which Of These Numbers Is Not Divisible By 3?

1.	Which Of These Numbers Is Not Divisible By 3?
Answer» One may answer this question USING a calculator and test for divisibility by 3. HOWEVER we can also test for DIVISIBILTY by adding the digits and if the result is DIVISIBLE by3 then the number is divisible by 3. 3 + 3 + 9 = 15 , divisible by 3. 3 + 4 + 2 = 9 , divisible by 3. 5 + 5 + 2 = 12 , divisible by 3. 1 + 1 + 1 + 1 = 4 , not divisible by 3. One may answer this question using a calculator and test for divisibility by 3. However we can also test for divisibilty by adding the digits and if the result is divisible by3 then the number is divisible by 3. 3 + 3 + 9 = 15 , divisible by 3. 3 + 4 + 2 = 9 , divisible by 3. 5 + 5 + 2 = 12 , divisible by 3. 1 + 1 + 1 + 1 = 4 , not divisible by 3.

Answer»

One may answer this question USING a calculator and test for divisibility by 3.

HOWEVER we can also test for DIVISIBILTY by adding the digits and if the result is

DIVISIBLE by3 then the number is divisible by 3.

3 + 3 + 9 = 15 , divisible by 3.

3 + 4 + 2 = 9 , divisible by 3.

5 + 5 + 2 = 12 , divisible by 3.

1 + 1 + 1 + 1 = 4 , not divisible by 3.

One may answer this question using a calculator and test for divisibility by 3.

However we can also test for divisibilty by adding the digits and if the result is

divisible by3 then the number is divisible by 3.

3 + 3 + 9 = 15 , divisible by 3.

3 + 4 + 2 = 9 , divisible by 3.

5 + 5 + 2 = 12 , divisible by 3.

1 + 1 + 1 + 1 = 4 , not divisible by 3.

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