Question

Check whether 1240 is divisible by 3 and 4 (without actual division). Also state the reason for each.

Answer 1

Answer:

According to the divisibility test for 3, if the sum of digits of a number is divisible by 3 then the number itself is divisible by 3.

So, applying the divisibility test for 3,

3+4+2+2+1+8+6+4=30

3+0=3, which is divisible by 3.

Hence, the given number is divisible by 3.

Step-by-step explanation:

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