Question

write the divisiblility test for 3 , with example​

Answer 1

Answer:

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Step-by-step explanation:

In other words, a number is divisible by 3, if sum of all its digits is divisible by 3. For example: 79851 is divisible by 3 as the sum of its digits, i.e., 7 + 9 + 8 + 5 + 1 = 30 is divisible by 3. A number is divisible by 4 if the number formed by its digits in tens and units place is divisible by 4.

Answer 2

Step-by-step explanation:

If sum of the digits of the number is divisible by 3 the the whole number is divisible by 3.

Eg.

$3456$

Sum the digits of this number

$3456 = 3 + 4 + 5 + 6 \\ = 18$

Here we get 18 and 18 is divisible by 3 then 3456 must divisible by 3.

• Note if number is too big
• e.g. 3456223453

$3456223453 = 3 + 4 + 5 + 6 + 2 + 2 + 3 + 4 + 5 + 3 \\ = 36 \\ \\ 36 = 3 + 6 = 9$

we know that 9 is divisible by 3